Troubleshoot USB Problems

	When your Microsoft Windows XP-based computer returns from standby or from hibernation, you may receive a "STOP 0xFE" error message. This problem may occur if all the following conditions are true: You are using Windows XP Professional with Service Pack 1. You installed the update that is described in the following Microsoft Knowledge Base article: (http://support.microsoft.com/kb/822603/) Availability of the Windows XP S822603 USB 1.1 and 2.0 update You removed the universal serial bus (USB) 2.0 Enhanced Host Controller (EHCI) controller from Device Manager. For example, you may have removed the controller because Device Manager displayed an exclamation point in a yellow circle next to the listing for the controller. The details report displayed "Code 10". Note: The name of your USB 2.0 EHCI controller may vary.

	This article describes advanced troubleshooting tips for universal serial bus (USB) devices in Windows XP.
	When a USB device is repeatedly inserted and removed, the USB port may stop responding. This article describes how to resolve this problem with a unresponsive USB port.
	When you start a Windows XP-based computer, one or more of the attached universal serial bus (USB) devices do not work. This article describes possible reasons why the devices do not work. Also, this article contains methods that you can use to make sure that your USB devices work correctly.
	You disconnect a universal serial bus (USB) 2.0 printer from the USB port on your Microsoft Windows XP-based computer. In this scenario, an external USB 2.0 hub that is connected directly to another USB port on your computer may stop working. Note: This problem may also affect a port replicator that works as a USB 2.0 hub.
	After you attach a USB keyboard to your Windows XP-based computer, you cannot disable a universal serial bus (USB) host controller, a USB root hub, or other device in Device Manager.
	You may experience one of the following symptoms: When you start a Microsoft Windows XP-based computer that uses a universal serial bus (USB) mouse that is connected to a USB 2.0 hub, the USB mouse is not detected. When you plug a USB mouse into a USB 2.0 hub that is connected to a Windows XP-based computer, the USB mouse is not detected.
	When you try to print to a USB 2.0 printer that is connected to your computer through a USB 2.0 PC card adapter, your print job may not print, and you may not receive an error message.
	If you plug in a high speed USB 2.0 device to a USB port that does not have high speed support, you receive the following message: HI-SPEED USB Device Plugged into non-HI-SPEED USB Hub A HI-SPEED USB device is plugged into a non-HI-SPEED USB hub. For assistance in solving this problem, click this message. You will not get the maximum speed for your device unless you follow the instructions in the message.
	Consider the following scenario. You start to install Microsoft Windows XP on a computer to which a universal serial bus (USB) floppy disk drive is connected. Then, you press F6 to install mass storage drivers during the Windows XP installation process. Note These mass storage drivers reside on a floppy disk that is inserted in the USB floppy disk drive. In this scenario, the USB floppy disk drive does not work. Therefore, you cannot load the mass storage drivers.
	A Universal Serial Bus (USB) storage device may not work when you follow these steps: You plug the device into one USB port on the computer. You put the computer into standby (S3 power state). You unplug the device while the computer is in standby. You plug the device into a different USB port while the computer is still in standby. You resume from standby. You put the computer into standby (S3 power state). You unplug the device while the computer is in standby. You plug the device into a different USB port while the computer is still in standby. You resume from standby. You unplug the device while the computer is in standby. You plug the device into a different USB port while the computer is still in standby. You resume from standby. You plug the device into a different USB port while the computer is still in standby. You resume from standby. You resume from standby. In Device Manager, an exclamation point in a yellow circle, with a status of Code 42 (duplicate device), may appear next to the device.
	When you use the Safely Remove Hardware program to remove a universal serial bus (USB) device, you may experience one of the following symptoms: You receive the following error message: Rundll32.exe has encountered a problem and needs to close. We are sorry for the inconvenience. The wrong USB device is removed even though the USB device that you specified is still connected to your computer
	When you start or shut down your Microsoft Windows XP-based computer, either of the following behaviours may occur: A Universal Serial Bus (USB) device (for example, a USB mouse or a USB keyboard) may not initialize when Windows XP starts. Your computer may appear to stop responding (hang) when Windows XP starts or shuts down.
	When you start your computer by using a Windows Preinstall Environment (WinPE) image that was built in a Microsoft Windows XP Service Pack 1 (SP1) environment, USB 1.1-compliant devices may not work. Note: USB 1.1-compliant devices include mouse devices and keyboards.
	When you try to use a universal serial bus (USB) camera to stream video, you may receive an error message that is similar to the following: USB Controller Bandwidth Exceeded
	When you plug in some earlier versions of USB speakers to an external USB 2.0 hub, the speakers may not install correctly. As a result, they do not play sound from the computer, and Device Manager lists them as unknown devices.
	If you quickly swap a USB device that is attached to a UHCI USB host controller, the host controller may stop functioning. Note "Quickly swap" means that you unplug one USB device and plug in another USB device within five seconds. This behaviour typically occurs when the following conditions are true: If the USB device is programmatically controlled to report different device IDs, this behaviour causes the device to be re-enumerated as a different device. The behaviour does not typically occur when you just unplug one USB device and plug in a different USB device when the steps take longer than five seconds.
	When all the following conditions are true, you may not be able to resume your Microsoft Windows XP-based computer when you move your USB mouse or press a key on your USB keyboard: You have a universal serial bus (USB) mouse or a USB keyboard connected to your Windows XP-based computer. You put your Windows XP-based computer in standby. While your Windows XP-based computer is preparing to enter standby, you move your USB mouse or press a key on your USB keyboard. Note: Your USB mouse and USB keyboard are both connected to the same USB host controller. Additionally, after you resume the Windows XP-based computer by using the power button, your USB mouse and your USB keyboard may not work correctly.
	If you try to update the device driver for an EHCI USB 2.0 host controller by using the Update Driver function in Device Manager, USB 1.1 devices that are attached to the controller may stop functioning.
	If you connect a Universal Serial Bus (USB) input device (such as a keyboard or mouse) to a Windows XP-based computer on which Windows XP Service Pack 1 (SP1) or the USB 2.0 update is installed, you may receive the following error message while you are streaming USB audio or video: STOP: 0x0000007E (0xC0000005, address, address, address) usbhub.sys Note that the second, third, and fourth parameters in the error message may vary.
	This article describes the availability of universal serial bus (USB) 2.0 driver support in Microsoft Windows XP Service Pack 1.
	This article describes the maximum size of USB transfers on various Microsoft Windows operating systems.
	If you have multiple universal serial bus (USB) devices connected to an external USB hub, when you unplug a USB device during system hibernation and then plug another USB device into the same USB port, the new USB device may not function.
	If you plug a universal serial bus (USB) version 1.1 video device into a USB version 2.0 hub, the USB video device may not function correctly. The video image may be garbled, or the video image may not be displayed at all.
	After you unplug a universal serial bus (USB) display device from a Microsoft Windows XP-based computer, the USB display device may remain visible in Device Manager.
	When you wake up a Microsoft Windows XP-based computer from hibernation or from standby, you may receive the following error message: Power Surge on Hub Port: A USB Device has exceeded the power limits of its hub port. This error message is displayed even if there are no USB devices connected to the computer.
	You may experience one or more of the following symptoms when you try to transfer files to or from a device that is connected to a universal serial bus (USB) 2.0 hub in Microsoft Windows XP: When you try to transfer files, the file transfer fails. You may receive an error message about a delayed write failure. The error message that you receive may vary, depending on the device that you are using. Other USB devices that are connected to the USB 2.0 hub may stop working. You may receive notification that the USB devices have been disconnected or reconnected. Power may be disabled on USB devices. Then, the devices are re-enumerated. A USB keyboard may stop working correctly. For example, the behaviour of keys may be irregular. When you press a key, the key entry may be repeated many times. Alternatively, when you press a key, nothing may occur at all. Note: Some computers have an internal USB 2.0 hub. For example, a portable computer may have a single USB bus and may use an internal USB hub to provide two or more available USB ports on the computer. Therefore, this issue may occur if the device is connected directly to a USB port on the computer. This issue may also occur if the device is internal and is connected internally to the internal USB 2.0 hub. For example, this problem might occur if you use a portable computer that has an internal Bluetooth radio that is connected to an internal USB 2.0 hub. When you use this Bluetooth device to transfer the files to another device, you may experience the symptoms that are described in the "Symptoms" section.
	This article discusses two methods that you can use to prevent users from connecting to a USB storage device.
	When you plug a USB device into a Windows XP-based computer immediately after the computer comes out of standby (S3) or hibernate (S4), the computer may not recognize the USB device. When this issue occurs, the USB device may be listed in Device Manager as an unknown device, and you may receive the following warning message: Unrecognized device has been found.
	If you connect a new universal serial bus (USB) device to a USB 2.0 hub on a computer, the computer does not detect the USB device. This symptom occurs if the computer is running one of the following operating systems: Microsoft Windows XP Service Pack 2 (SP2) Microsoft Windows Server 2003 Service Pack (SP1) Microsoft Windows Server 2003 x64 versions Additionally, other USB devices that are already connected to the computer stop functioning, and you have to restart the computer to detect the USB devices.
	When you connect a new USB device to a computer that has no USB devices, Windows XP and Windows Server 2003 may not detect the new device.
	By default, Microsoft Windows XP and Microsoft Windows Server 2003 enable a universal serial bus (USB) keyboard and a USB mouse to wake a computer after the computer goes in hibernation. Other types of USB devices can be enabled to wake the computer if you click to select the Allow this device to bring the computer out of standby check box. You can click to select this check box on the Power Management property page in Device Manager. When a USB device is enabled to wake the computer, the default behaviour permits the computer to enter the S1 system power state for standby. Standby is not the S3 system power state. The S1 system power state is a "lighter" system power state than S3. The S1 system power state typically conserves less power than the S3 system power state. By using the following registry entry, you can override entering the S1 system power state as a default behaviour when a USB device is enabled to wake the computer: USBBIOSx
	A device that contains more than one interface descriptor is known as a composite USB device. Each interface in a composite USB device is numbered. When you attach a composite USB device whose interfaces are not sequentially numbered to a computer that is running Microsoft Windows XP, the composite USB device does not start.
	Microsoft has released the updated USB Video Class (UVC) driver for Microsoft Windows XP with Service Pack 2 (SP2). The updated driver adds the following capabilities: Digital video (DV) data rendering to let you stream DV data from the host computer to the device MPEG2TS capture to let you stream USB Isochronous MPEG2 transport streams from the device to the host computer
	If you unplug all your Universal Serial Bus (USB) devices from the host controller, the host controller may not respond when you plug these devices in again. Additionally, after you remove all these devices, your computer may stop responding (hang) during the shutdown process. This problem is more likely to occur if several USB hubs are cascaded and USB devices are connected to the cascaded hubs.
	This article describes how to configure an Alcatel Universal Serial Bus (USB) modem from British Telecom for ADSL connectivity.
	You may experience one or more of the following problems in Windows XP: When you are listening to audio over Universal Serial Bus (USB) speakers, you may hear a pop. This may occur from every few seconds to every few minutes. When you are connected to the Internet via an USB modem, you may encounter data transfer errors or even lose connection during heavy transfers.
	After you install Microsoft Windows XP Service Pack 2 on a computer that is running Microsoft Windows XP, the universal serial bus (USB) drivers do not appear to update.
	When you use a multifunction, composite USB device that includes a network interface, the network interface does not work in Microsoft Windows XP with Service Pack 2.
	After you install the hotfix that is described in Microsoft Knowledge Base article 816509 on a Hyper-Threading enabled computer, you may not be able to wake up your computer from standby by moving a USB mouse, by clicking a USB mouse, or by pressing keys on a USB keyboard.
	When a computer running Microsoft Windows XP Service Pack 1 (SP1) resumes from hibernation, certain USB 2.0 devices may appear to be removed, and therefore they no longer function.
	When you try to wake your computer (that is, to bring it out of standby or out of hibernation) by using a USB device, such as a USB mouse or a USB keyboard, the computer stops responding, or "hangs." Note: This problem may not occur until after you install the Windows XP SP1 USB 1.1 and 2.0 Update (822603).
	When one or more of the following conditions are true, the universal serial bus (USB) devices that are connected to your computer may not function when your computer resumes from a standby state: You have one of the following Toshiba notebook computers together with a port replicator: Toshiba Portege 4000 Toshiba DynaBook SS M3/M4 Toshiba DynaBook SS 4000 The BIOS version of your Toshiba notebook computer is later than v2.10. You are running Windows XP Service Pack 1 (SP1) together with the USB 1.1 and 2.0 updates. This problem may occur if you install a new USB device.
	USB devices that are using an SCSI-to-USB adapter are displayed as "USB SCSI Storage Device" in the Safely Remove Hardware icon in the taskbar. Finding which device you want to remove may be confusing if your computer has more than one of these devices.
	When you play an audio file through your USB speakers, you may hear distortion such as a popping or crackling noise. This symptom may occur about every minute when your USB speakers are at a high volume.

	When you try to use a UMAX Astra Universal Serial Bus (USB) scanner with your Windows XP-based computer, the scanner may not work correctly.
	When you try to play audio on a Microsoft Windows XP-based computer, you experience frequent disruptions and long delays in the audio stream. This symptom occurs if the following conditions are true: You use a universal serial bus (USB) 2.0 audio device to play audio. The USB 2.0 audio device uses high-speed isochronous transfers to play audio. You are using a Microsoft Windows XP-based computer. The audio device driver uses large data transfers.
	If you perform a backup operation or a restore operation by using the Microsoft Windows backup utility (Ntbackup.exe), and you back up to an Advanced Intelligent Tape (AIT) tape drive that has a Universal Serial Bus (USB) 2.0 interface, the operation may not succeed. If this problem occurs, you receive the following error message in the backup report: Error: An inconsistency was encountered on the requested media.
	When you resume your Microsoft Windows XP-based computer from standby, your universal serial bus (USB) keyboard or your USB mouse may not work if you resume operations by using any one of the special function keys on the keyboard (such as Volume Control). When you view Device Manager, the icon that represents your USB keyboard or your USB mouse may have a yellow-highlighted exclamation point in the lower-right corner. In this scenario, you must restart your computer to regain USB keyboard or USB mouse functionality.
	Microsoft has released a new Microsoft Windows XP universal serial bus (USB) video class driver. The USB video class driver for Windows XP supports the following features: The USB video class specification All Universal Virtual Computer (UVC) 1.0 compliant devices that support the Interface Association Descriptor (IAD) Motion Joint Photographic Experts Group (MJPEG), digital video (DV), and uncompressed payload formats Note: Video capture is only through the UVC device to host. Media transport terminal Extension unit
	This article describes how to enable the Wake from standby option for a Universal Serial Bus (USB) mouse.
	If you disconnect a Universal Serial Bus (USB) camera from your computer after you suspend and then resume the computer, the camera may remain in Device Manager. If Device Manager is running when you remove the camera, Device Manager may stop responding (hang) if you try to scan for new hardware. If Device Manager is not running when you remove the camera, Microsoft Management Console (MMC) may hang when you try to start Device Manager. This problem may occur under the following conditions: Your computer is compliant with the Advanced Configuration and Power Interface (ACPI) specification. Your computer supports USB. You connect a USB camera before you suspend the computer. This problem may occur if you connect the USB camera to a USB port on either a port replicator or a docking station.
	Microsoft Windows XP or Microsoft Windows 2000 incorrectly indicates that your USB printer is offline. This problem occurs even though the printer is turned on and is correctly connected to the USB port.
	Consider the following scenario. You are running a Microsoft Windows XP-based computer. You apply a USB-related hotfix to this computer. Then, you put the computer into either hibernation or standby. However, after you resume the computer from hibernation or from standby, the hotfix no longer works. Specifically, the USB-related problem that was resolved by the hotfix occurs again after you resume the computer from hibernation or from standby.
	After you disconnect and quickly reconnect a universal serial bus (USB) cable, a program cannot re-establish communication with the USB modem device. This behaviour describes the typical symptoms. The exact symptoms that you experience depend on the program that you are using.
	Your computer may stop responding (hang) during shutdown if the USB selective suspend option of your USB mouse is turned on.
	After you connect a TV tuner to a universal serial bus (USB) port on your Microsoft Windows XP Media Center Edition 2005-based computer, you may receive the following error message when you try to watch live TV: No Tuner Available No TV tuner cards are configured to work with Media Center. Go to TV Settings and setup your TV signal. When you restart Media Center or restart your computer, the problem is not resolved.
	A 0x7E Stop error occurs on your Microsoft Windows XP-based portable computer. This error may occur after you close a program that has an open handle to a file on a universal serial bus (USB) 2.0 flash storage device. For example, a 0x7E Stop error may occur if you do the following: You connect a USB 2.0 flash storage device to your portable computer by using a USB port on your docking station. You use a program, such as Microsoft WordPad, to save a file to the USB 2.0 flash storage device. You change the file but do not save it. You disconnect the USB 2.0 flash storage device. You disconnect the portable computer from the docking station. You close the program. You are not prompted to save the file, and a 0x7E Stop error occurs.
	After you add a universal serial bus (USB) camera or a TV tuner card to a Microsoft Windows XP-based computer, a Local Area Connection 2 icon may be created in the View Network Connections section in My Network Places. The information that is displayed below this icon describes the connection as: Microsoft TV/Video Connection
	You may experience one or more of the following symptoms on your Microsoft Windows XP Media Center Edition-based computer: The remote device stops working while you are changing TV channels. An external universal serial bus (USB) hard disk stops working. Other USB peripheral devices, such as card readers, keyboards, or mouse devices stop working. These devices are typically connected to an internal USB hub. Note: When these devices are connected to an internal USB hub, the connections are not visible. Therefore, you may not be able to see that the devices are connected to the computer's USB bus.
	When you use a Visioneer universal serial bus (USB) scanner, your computer may experience a sudden, unusually high amount of CPU usage. After the scanner is installed, Task Manager may report that the service host program (Svchost.exe) utilizes 10 to 30 percent of the CPU. However, when you disable the scanner by using Device Manager, the unusually high amount of CPU utilization is stopped (and lowered).
	When you try to manually put your Microsoft Windows XP-based computer on standby after you install the Microsoft Fingerprint Reader or the Microsoft Optical Desktop with Fingerprint Reader, you may receive an error message that is similar to the following: The driver from USB Composite Device is preventing the system from entering standby.
	When your computer resumes from hibernation, your USB keyboard and mouse that are connected to a USB 2.0 controller may take a long time to respond.
	When you use the backup program that is included with Windows 2000 (NTBackup.exe) with certain models of USB tape drives, you may not be able to restore backups from the USB tape drive or back up to the drive if the Verify option is turned on. You may receive one of the following error messages: When you generate a catalog from the tape media: Unrecognizable Media The media in the drive has an unrecognizable format or is not formatted. When you restore from a backup set: Required Media Missing The next media required in the active family is not currently on-line. Please insert the media: Name_of_backup_media, media #0 or click Cancel to stop the current operation. The message is displayed even when the correct media is inserted. After you click Cancel: Drive Error The device reported an error on a request to mount the media. Error reported: Unknown error. There may be a hardware or media problem. Please check the system event log for relevant failures. When you perform a backup operation with the Verify option turned on: Backup Utility An inconsistency was encountered on the requested media. When you perform a backup operation and append the backup set to existing media: Backup Utility An inconsistency was encountered on the media in Name_of_drive. Do not append to this media.
	When you are using a Webcam and a video capture program to capture video, the video capture frame rate may slowly decrease. After this decrease occurs, your video capture program may stop responding (hang). This symptom occurs if the following conditions are true: Your Webcam is connected to a universal serial bus (USB) version 2.0 Enhanced Host Controller Interface (EHCI) USB controller. You are using a USB 2.0 isynchronous Webcam to capture video.
	When you try to scan an image on a Universal Serial Bus (USB) multifunction printer/scanner device, the scan may not succeed.
	When you attach a new USB device, such as a digital camera, to your Microsoft Windows XP Media Center Edition 2004-based computer, Media Center does not display the device in Other Media.
	When you unplug a Universal Serial Bus (USB) 2.0 storage device from your computer, you may receive an error message that is similar to the following: {Delayed Write Failed} Windows was unable to save all the data for the file \Device\HardDiskVolume"
	This article describes how the Windows Image Acquisition (WIA) service assigns device identifiers (IDs) and how ID assignment affects where preview images from a Universal Serial Bus (USB) camera are stored on the computer.
	When you connect a mobile device to a desktop computer through a universal serial bus (USB) port, the connection may be intermittently lost. This problem occurs when the following conditions are true: The desktop computer has an Enhanced Host Controller Interface (EHCI) USB 2.0 Host controller. The desktop computer is running Microsoft Windows XP Service Pack 1 (SP1). The mobile device is running Microsoft Windows Mobile 5.0.
	When you return your computer from standby or suspend, your Universal Serial Bus (USB) keyboard may not function. This problem may occur on computers that use the Intel ICH2 chipset for USB functionality.
	When you start a program that accesses a universal serial bus (USB) 2.0 camera device, you receive an error message that is similar to the following: The camera device is not correctly recognized. Additionally, the program stops responding.
	A universal serial bus (USB) input device, such as a keyboard or a mouse, may not work during the Installing Devices portion of GUI-mode Windows Setup. This behaviour can prevent Setup from completing: if Setup tries to install an unsigned driver, an Unsigned Driver dialog box appears and requires user input.
	When you connect a Universal Serial Bus (USB) hard disk drive to your computer, the hard disk’s icon and label are not displayed correctly.
	When you start your computer from a Microsoft Windows Preinstall Environment (WinPE) CD-ROM, or from a Microsoft Windows Server 2003 CD-ROM, by using a USB CD-ROM device, the computer may restart. You may receive the following Stop error message on a blue screen: STOP 0x0000007B: INACCESSIBLE_BOOT_DEVICE Fatal System Error
	When you have a Microsoft Natural Keyboard Elite attached a Universal Serial Bus (USB) 2.0 port, you may not be able to resume your computer from hibernation.
	After you install Windows XP Service Pack 2, you may experience any one of the following symptoms when you safely remove an encrypted USB storage device: Your computer automatically restarts. After you log on, you receive the following error message: Microsoft Windows The system has recovered from a serious error. A log of this error has been created. Please tell Microsoft about this problem. We have created an error report that you can send to help us improve Microsoft Windows. We will treat this report as confidential and anonymous. To see what data this error report contains, click here. You receive the following Stop error message: A problem has been detected and Windows has been shut down to prevent damage to your computer... Technical information: *** STOP: 0x000000E3 (0x82175704, 0x82282da8, 0x00000000, 0x00000002) Bug Check Symbolic Name
	On some portable computer systems, the system stops responding when resuming from standby. This problem occurs on portable computer systems whose installed audio/video (A/V) streaming devices use universal serial bus (USB) connectors.
	A universal serial bus (USB) smart card reader that is connected to a Microsoft Windows Server 2003-based computer stops responding (hangs). Note: This also applies to Microsoft Windows XP Professional x64 Edition.
	When you try to capture a picture on a universal serial bus (USB) scanner device that is plugged into a Microsoft Windows XP-based computer, the picture may not be captured correctly.
	When you use a USB MIDI device, if the sample MIDI data input packet is larger than 256 bytes, you may experience incorrect playback or no playback at all.
	When you install a new universal serial bus (USB) device on your Microsoft Windows XP-based computer, you may receive the following message: The installation of new device is completed. You need to restart so that the changes made take effect. Do you want to restart now? You must restart your computer to use the new USB device in this scenario.
	When you start your Microsoft Windows XP-based computer, and you have a universal serial bus (USB)-based CD-ROM drive attached to the computer, the CD-ROM drive may be mapped to more than one drive letter.
	When you try to install a SpeedStream 4060 USB ADSL modem from Efficient Networks on your computer, you may not be able to install the vendor-supplied installation software. You may also receive the following error message: There was a problem installing this hardware - Efficient Networks Speedstream 4060 Modem - An error occurred during the installation of the device. The required section was not found in the INF.
	Symptoms Section When you connect a Pocket PC handheld device to a USB 2.0 hub, or when you turn off the device and then turn it back on again while the device is still connected to the USB 2.0 hub, Microsoft Windows may not redetect the device. This problem may also occur with other USB devices that have pending transfers if the device is disconnected and then reconnected; or if the device is turned off and then turned back on while it is still connected to the USB 2.0 hub.
	When you upgrade a computer that has a Xircom Rex 6000 installed that uses the universal serial bus (USB) cradle, you may receive the following error message when the computer starts in Windows XP for the first time: A Fatal System Error has occurred: 0x000000be (0x80129768, 0x00129121, 0xF96A4754, 0x0000000B) This error may also occur if you connect the USB cradle for the Xircom Rex 6000 to a computer that is running Windows XP, and then you begin the installation process during the hardware identification phase.
	After you install a Microsoft IntelliMouse pointing device, you receive an error message that is similar to one of the following: PS/2 port mouse has not passed Windows logo testing to verify its compatibility with Windows XP. USB Wireless IntelliMouse Explorer has not passed Windows logo testing to verify its compatibility with Windows XP. The specified location does not contain information about your hardware. An error occurred during the installation of the device. The driver selected for this device does not support Windows 2000.
	If you unplug the Universal Serial Bus (USB) cable for an Integrated Services Digital Network (ISDN) modem that you use for both incoming and outgoing traffic while the modem is dialing, you may receive the following error message: Error 651: The modem (or other connecting device) has reported an error. After you plug the modem's USB cable back in, you will receive the error each time the modem dials until you restart your computer. This error may also occur with other hot swap technologies, such as Personal Computer Memory Card International Association (PCMCIA), but this behaviour has not been confirmed by Microsoft.
	When you unplug a Universal Serial Bus (USB) microphone, you may experience any of the following symptoms: A program that is currently using the microphone (such as Microsoft NetMeeting, GraphEdit from the Microsoft DirectShow SDK, or AmCap).
	On a Dell Inspiron 4000, universal serial bus (USB) devices do not function during the Text-mode portion of Windows XP Setup.
	If you put a 2DD 720 kilobyte (KB)-formatted disk into the USB floppy disk drive, and then connect the USB floppy disk drive to the computer, a 5-inch disk icon appears in My Computer instead of a 3.5-inch disk icon.
	When you connect audio speakers to the universal serial bus (USB) port on your computer, digital audio playback may be choppy or distorted during playback. This problem is more common during heavy file input/output (I/O) operations, such as when you copy files from a CD-ROM to a hard disk.
	When you plug the Canon Canoscan 620U scanner in to a Universal Serial Bus (USB) port for the first time, the Add New Hardware wizard starts, but it installs the scanner as an unknown device.
	While the system is entering a standby (or suspended) state, if you click the USB mouse before the standby process is completed, the USB mouse or USB keyboard (or both) may not wake the computer.
	When you install an iKey 1000 security device from SafeNet, Inc. on a Microsoft Windows XP-based computer, and then you disable the USB 2.0 Enhanced Host Controller Interface (EHCI) controller, you may be prompted to restart the computer. After the computer restarts, USB 1.1 devices that are connected to your computer may be unavailable.
	When you attach a Universal Serial Bus (USB) device, you may receive a "USB hub power exceeded" error message that contains the following text: The hub does not have enough power available to operate the device driver name. Would you like assistance in solving this problem? If you click No, the device may not function properly. In addition, the USB device mentioned in the error message does not work properly and the device listing (located in the System properties of the Device Manager properties window for the device) is displayed with the following error message: A USB device has requested more power than the hub can provide. Windows cannot enable the device. Remove the device and restart your computer.
	When you try to start your Microsoft Windows XP Service Pack 1 (SP1)-based computer, it may stop responding or "hang". This problem may occur if you have both USB 2.0 devices and USB 1.1 FDD devices connected to a Windows XP SP1-based computer. Because Windows XP SP1 does not support the USB 2.0 Legacy BIOS, the USB 1.1 device driver does not work correctly.
	You remove an external USB 2.0 hub from a Microsoft Windows XP-based computer. After you do this, USB devices or optical drives that were connected to the USB 2.0 hub are not immediately removed from Device Manager. The devices remain in Device Manager for several minutes, even though they are no longer connected to the computer. Note: This problem can also occur when you remove a Windows XP-based computer from a docking station. The problem occurs if the docking station contains an integrated USB 2.0 hub that has connected devices.
	After you remove a USB floppy drive from the Toshiba Tecra 9000 portable computer by using the Safely Remove Hardware option in Microsoft Windows XP, the processor may never switch to the C3 power-saving state.
	You may experience any of the following symptoms: Your Hi-Speed Universal Serial Bus (USB) 2.0 device does not operate in Hi-Speed mode. If you plug in a Hi-Speed USB 2.0 device, you receive any of the following warnings: The Generic USB Hub is a HI-SPEED USB device and will function at reduced speed when plugged into a non-HI-SPEED port. HI-SPEED USB Device Plugged into non-HI-SPEED USB Hub. A HI-SPEED USB device is plugged into a non-HI-SPEED USB hub. An Enhanced Host Controller Interface-compliant (EHCI-compliant) USB host controller appears in Device Manager with an exclamation point in a yellow circle, or with status code 28.
	When you click the “Safely Remove Hardware” icon in the system tray to remove hardware, you may receive an error message and can not remove it successfully.
	When you try to manually delete a universal serial bus (USB) printer port in Microsoft Windows Server 2003 or in Microsoft Windows XP, the operation is unsuccessful.
	During the installation of the manufacturer's driver for the Mustek Be@rPaw 1200 Universal Serial Bus (USB) scanner, the software that is bundled with this driver may generate Error 401. During the installation of Adobe Acrobat Reader 4.0, which is one of the bundled programs, the installation may generate the following error message: String variable is not large enough for string. Check the string declarations. Error 401.
	After you attach a keyboard, a mouse or another USB-based input device to your computer, your computer may no longer shut down correctly. For example, your computer may stop responding (hang) after you click Turn off or Restart. This issue may occur when the selective suspend functionality is enabled on a device that does not support it. This situation may occur when two or more USB-based devices have the same vendor and product identification numbers, and when only one of the devices supports the selective suspend functionality.
	When you plug in your Microtek V6UPL scanner to a USB port after you install the manufacturer-supplied driver (ScanWizard version 5.05), you may receive the following error message: Installer can't find lstwain.ds
	If you have a Universal Serial Bus (USB) 3.5-inch floppy disk drive attached to your computer and you start your computer into Safe mode, the USB floppy disk drive may be identified as a 5.25-inch drive.
	When you plug a Universal Serial Bus (USB) mouse in to your computer, the mouse does not work.
	Your Windows XP PC may not recognize the removable storage devices that you connect to your PC. However, the other USB devices may work normal. This is not an issue... Note: This article is very badly written. Take two packs of aspirins and have a good lie down.
	When you resume your computer from standby or hibernation, you may receive a "USB Device Not Recognized" error message. This error message occurs only if USB/PS2 combination devices are attached to the computer. One example of such a device is a keyboard that has both USB and PS2 connectors. You can use either connector for all of the keyboard functions.
	When you attempt to install Microsoft Windows XP on a computer that is based on the Intel i815 chip set and has a universal serial bus (USB) keyboard and mouse attached, you may experience the following behaviour: The computer may stop responding (hang) during Setup. The computer may stop responding during startup after you finish installing Windows XP.
	When you try to install the drivers for a BeWAN ADSL USB ST modem or for a for a ZyXEL Omni.net ISDN USB modem, your computer may unexpectedly stop responding.
	After your Microsoft Windows XP-based computer resumes from hibernation, and then you use the Safely Remove Hardware function to remove a USB floppy disk drive, the computer stops responding (hangs).
	After you upgrade your Toshiba Portege 7020CDT portable computer to Windows XP, you may not be able to log on by using your Microsoft Universal Serial Bus (USB) ergonomic keyboard.
	When you try to transfer data to a USB (universal serial bus) device, you may receive an 8E Stop error message on a blue screen. You may see reference to the Usbser.sys file on the blue screen.
	On a Microsoft Windows XP-based computer that uses certain ATI chipsets, you do not receive notification when the USB bus is overloaded. For example, you do not receive notification if the sum of the power requirements for the connected USB devices is more than the available power that is provided by the USB bus. Note If you have too many USB devices connected to the USB bus, one or more of these USB devices may not work. You do not receive notification when the USB bus is overloaded on a computer that is running Microsoft Windows Server 2003 or Microsoft Windows XP Professional x64 Edition. For example, you do not receive notification if the sum of the power requirements for the connected USB devices is more than the available power that the USB bus provides. Note If you have too many USB devices connected to the USB bus, one or more of these USB devices may not work. Also, if the overload condition causes a USB port failure, the system may stop responding or crash.
	When you try to connect a device to a desktop computer that is running Microsoft Windows XP or Microsoft Windows Server 2003, the device may not establish a connection with the desktop computer. This problem occurs when you try to connect the device to the desktop computer through an external USB port hub.
	When you try to install a serial modem or a universal serial bus (USB) modem on your Microsoft Windows XP Service Pack 2 (SP2)-based computer, you may receive the following error message: Windows was unable to install the modem
	After you insert a USB 2.0 PCMCIA adapter into one of the following Toshiba computers, the built-in USB devices may stop working: PORTEGE 2000 DynaBook SS 2000 DS80P/2 DynaBook SS S4/275PNHW DynaBook SS 2000 DS75P/2
	When you use your Microsoft Windows XP-based computer to capture digital video (DV) content from a video camcorder that is connected by using a universal serial bus (USB) connector, not all the content is captured. Some frames of DV content may be dropped.
	When you press a key on your Universal Serial Bus (USB) keyboard, use a USB mouse, or use the computer's power button to resume your computer from standby (an S3 state), the first keystroke may be lost. Although subsequent key strokes wake the computer, these key strokes are passed along to the program that currently has focus.
	You use a computer that is using Intel Centrino Duo Mobile Technology. The computer is running Microsoft Windows XP or Microsoft Windows Server 2003. After you install version 7.2.2.1006 of the Intel Chipset Software Installation Utility on the computer, USB devices no longer work correctly. When this problem occurs, a yellow exclamation mark may appear next to the USB devices in Device Manager.
	After you plug an external universal serial bus (USB) hub into your Microsoft Windows XP-based computer, and then you unplug the USB hub, your computer may not be able to enter the C3 low-power idle state. To verify this problem, add the %C3 Time or the C3 Transitions/sec counter in Performance Monitor, and then plug in and unplug an external USB hub. In this scenario, the %C3 Time or the C3 Transitions/sec counter remains stuck at zero.
	During isochronous transfers, isochronous endpoints that specify the following periods work correctly: 1 (one transfer every microframe) 8 (one transfer every eight microframes) However, isochronous endpoints that specify the following periods do not work correctly: 2 (one transfer every two microframes) 4 (one transfer every four microframes) Isochronous transfers with these endpoints may not be completed successfully, or may complete with incorrect data.
	You are using a Microsoft Windows XP Media Center Edition 2005-based computer. The computer may become slow or unresponsive if you connect an empty USB flash drive when the mouse pointer is located over an option in Online Spotlight. The Processes tab in Windows Task Manager shows that the Ehshell.exe process is using a very high percentage of CPU resources. The computer returns to typical operation after about ten minutes. Note This problem occurs only the first time that you connect the drive during the current session of Windows.
	When you restart your Microsoft Windows XP-based computer, you cannot connect to your wireless network. This problem may occur if your computer uses a USB wireless network adaptor for wireless access. The problem occurs because Windows XP does not correctly regain an IP address after the computer is restarted.
	Consider the following scenario: You use a USB camera on a Microsoft Windows XP-based computer to capture video. You put the computer on standby. You resume the computer from standby. In this scenario, the camera waits approximately 8 seconds before it restarts video capture.
	You connect a digital video (DV) camera to a USB 2.0 port on a Microsoft Windows XP-based computer, and you use Microsoft Windows Movie Maker to capture video. If you use the DV camera controls that are in the Video Capture Wizard to rewind or to fast forward, Windows Movie Maker may stop capturing video.
	If you use a Microsoft SideWinder USB Game Controller with Microsoft Windows XP-based computer, you may experience one of the following symptoms: When you plug in the controller, Windows XP does not detect or install the controller. The Found New Hardware Wizard is not displayed. When you try to add a game controller in Game Controllers Control Panel and you specify Microsoft SideWinder (Auto Detect), the controller is not detected.
	After a Microsoft Windows XP Media Center Edition 2005-based computer enters Away mode, nothing happens when you press the Sleep button on the USB keyboard. Additionally, the system idle timer is not reset. Therefore, the computer may eventually enter the S1 or S3 state of Advanced Configuration and Power Interface (ACPI) standby. (The computer enters standby after the interval that you specified on the Power Schemes tab of the Power Options dialog box.) The computer may enter standby even though you have pressed the Sleep button while the system is in Away mode.
	Device Manager displays only non-Plug and Play devices, drivers, and printers when you click Show hidden devices on the View menu. Devices that you install that are not connected to the computer (such as a Universal Serial Bus [USB] device or "ghosted" devices) are not displayed in Device Manager, even when you click Show hidden devices.
	When you try to install a Brother MFC 8700 multifunction USB device on a computer that runs Windows XP 64-Bit Edition, the scanning and faxing components are detected as USB devices, but you are unable to install the drivers for these components.
	If you connect a Fujitsu Universal Serial Bus (USB) infrared remote control to a Windows XP-based computer and the remote control device has a button, an application error may occur in the Game Controllers tool (Joy.cpl) in Control Panel.
	If you are using a NEC PC98-layout Universal Serial Bus (USB) keyboard, the keypad equal sign (=) key may not work.
	When you unplug the universal serial bus (USB) cable while playing or while recording with the USB Musical Instrument Digital Interface (MIDI) device for Turtle Beach, the MIDI application may stop responding.
	When you try to preview video or still images from an imaging device (for example, from a USB camera) in My Computer, you may receive the following error message: Video Preview Failure Creation of the video preview failed. Please check the device connection and make sure that the device is not being used by another application or user.
	After you connect an external hard disk drive or a universal serial bus (USB) flash drive to a computer that is running Microsoft Windows XP Media Center Edition 2005, the Import option may not be available in My Pictures or in My Videos.

	If a Windows XP-based computer has a wireless network adapter connected through a universal serial bus (USB) connection, and the computer resumes from standby or hibernation, the wireless connection icon may appear in the notification area (at the far right of the taskbar) with a red X and the following message: Wireless Network Connection Wireless Connection Unavailable Even though you receive this message, the wireless network connection may still be active and functioning correctly, and therefore you may still be able to successfully connect to network resources over the wireless network connection.
	When you repeatedly start and stop the universal serial bus (USB) modem driver (Usbser.sys) on a Microsoft Windows XP-based computer, a memory leak may occur.
	When you install a scanner other than the Hewlett-Packard (HP) 6300 Series universal serial bus (USB)/small computer system interface (SCSI) scanner on a 64-bit Windows XP-based computer, the installation program is unable to locate any drivers and you are prompted for a driver disk. Note: This article applies to Microsoft Windows XP Professional x64 Edition.
	When you insert an external media (for example, a USB memory stick or hard disk drive) that contains your pictures or multimedia videos, Microsoft Windows XP Media Center Edition may not detect the external media.
	When you connect a removable media storage device (for example, a universal serial bus [USB] drive) to a computer that has Microsoft Windows XP installed, the default drive icon and drive label that you selected when you set up the drive do not appear. Instead, the standard Windows drive icon and drive label appear.
	When you: create a new volume on a local disk. plug in a removable disk with existing volumes. plug in a removable drive (for example, a USB floppy drive or PCMCIA flash card). add a physical hard disk or CD-ROM drive to your computer. use Offline Files and specify items to be synchronized when you log on. You may experience any of the following symptoms: An existing mapped network drive is no longer available in Windows Explorer. The new drive is not available in Windows Explorer. The new drive appears in Windows Explorer, but when you open it the contents of the existing drive are displayed. The existing drive appears in Windows Explorer, but when you open it the contents of the new drive are displayed. After your computer starts, the network drive may be replaced by the new drive. After you disconnect the new drive, the mapped network drive letter has the same logical drive letter that it had before you added the new drive. You may receive the following error message when you start your computer: The local device name is already in use.
	When you write data to an external storage device such as a USB flash card reader or a Magneto-Optical (MO) drive, it may take a very long time for all the data to be written to the device. If you examine a bus trace of that device, you notice that there are many duplicate write operations (where the same data is written to the same destination).
	If you unplug a USB audio device that is based on the port class system driver (PortCls.Sys) while the device is streaming, PortCls.Sys does not correctly handle the close notification (IRP_MJ_CLOSE) that occurs after the surprise removal notification (IRP_MN_SURPRISE_REMOVAL) is generated. This behaviour prevents PortCls.Sys from correctly closing the stream and from performing the handle cleanup. Additionally, the IRP_MN_REMOVE_DEVICE notification is not generated because open handles remain.
	When you press ESC on a Universal Serial Bus (USB) keyboard, Microsoft Windows XP Media Center does not switch from full-screen mode to windowed mode. Note When you press ESC on a PS/2 keyboard, Media Center will switch to windowed mode.
	When you disconnect or remove a peripheral device from your computer, such as a universal serial bus (USB) camera or a Secure Digital (SD) storage card, the driver for that device may not be unloaded as expected.
	A Microsoft Windows XP-based computer stops responding (hangs) when you try to perform one of the following operations: Put the computer on standby or into hibernation. Resume the computer from standby or from hibernation. Use the Shut Down command on the Start menu. This problem occurs when the following conditions are true: A universal serial bus (USB) camera is connected to the computer's USB root hub or USB port. Note: Some computers have an internal USB hub. For example, a portable computer may have a single USB bus and use an internal USB hub to provide two or more USB ports on the computer. The Allow the computer to turn off this device to save power option is enabled for the USB camera. This problem occurs if the USB root hub uses either USB 1.1 or USB 2.0.
	You use the Import wizard to import pictures from an external media source, such as a digital camera or a USB flash drive, to the Microsoft Windows XP Media Center Edition 2005 photo library. Some of your files are not imported. You do not receive an error message to notify you that not all files were imported.
	When you start your Windows 2000-based, Windows XP-based, or Windows Vista-based computer, you may be unable to skip the Autocheck process by pressing any key when you receive the following message: To skip disk checking, press any key within number seconds. where number is a number that counts down from 10 to 0.
	After you attempt to start your computer in Safe mode by pressing the F8 key at the Microsoft Windows XP boot menu screen, and then selecting one of the Safe mode options, your computer keyboard or mouse may not respond when you try to use them.
	When you disconnect a USB hub from a Windows XP-based computer, and then you reconnect the USB hub, USB devices that are connected to the USB hub do not work. Additionally, when you connect additional USB devices to the USB hub, the additional devices are not detected, and they do not work. This problem may occur only occasionally. Note: The USB hub may be integrated into a docking station or into a port replicator. Therefore, you may also experience this problem when you disconnect a portable Windows XP-based computer from a docking station or from a port replicator, and then you reconnect the computer. When you reconnect the computer, USB devices that are connected to the docking station or to the port replicator do not work.
	When you connect a USB 1.x device to a USB 2.0 hub on a Microsoft Windows XP Service Pack 2 (SP2)-based computer, the data transfer speed of the USB 1.x device may be slower than expected. Note: This problem may also occur on a Windows XP Service Pack 1 (SP1)-based computer after you install the hotfix that is described in the following Microsoft Knowledge Base article: (http://support.microsoft.com/kb/810090/) "Universal serial bus devices may not always be detected when you start or resume the computer in Windows 2000 or in Windows XP"
	Consider the following scenario: You have a universal serial bus (USB) hub that is connected to a Microsoft Windows XP-based computer. You have a USB device that is connected to the hub, and the USB device works correctly. You disconnect the USB device from the hub, and then you reconnect the USB device to the hub. In this scenario, Windows may not detect the USB device when it is reconnected to the hub. When this problem occurs, the USB device does not work correctly. Additionally, Device Manager lists the USB device as an unknown device.
	If you use two universal serial bus (USB) streaming-video cameras at the same time on a Microsoft Windows XP Service Pack 2 (SP2)-based computer, you may receive the following Stop error message: STOP 0x000000FE (Parameter1, Parameter2, Parameter3, Parameter4) This problem occurs when the capture program that you use closes.
	Consider the following scenario: You use a computer that is running Windows Server 2003 or Windows XP Professional x64 Edition. An NVIDIA USB controller is being used on the computer. The USB bus on the computer becomes overloaded. In this scenario, you do not receive an overload notification. For example, you do not receive a notification if the sum of the power requirements for the connected USB devices is more than the available power that the USB bus provides. Note: If you have many USB devices that are connected to the USB bus, one or more of these USB devices may not work. Also, if the overload condition causes a USB port failure, the system may stop responding.
	After you install a univeral [sic] serial bus (USB) telephony device on a Microsoft Windows XP-based computer, this device is unexpectedly set as the default audio device. The USB telephony device can be a USB telephone, a USB handset, or a USB headset. This behaviour occurs even though other audio devices are already installed on the computer. In this situation, the computer cannot correctly play media or record media.
	Consider the following scenario: You are using a Lenovo ThinkPad portable computer that has one of the following configurations: Windows XP Service Pack 1 (SP1) is installed together with the USB 1.1 and 2.0 Update. For more information about the USB 1.1 and 2.0 Update, click the following article number to view the article in the Microsoft Knowledge Base: (http://support.microsoft.com/kb/822603/) Availability of the Windows XP Service Pack 1 USB 1.1 and 2.0 Update Windows XP Service Pack 2 (SP2) is installed together with the USB 1.1 and 2.0 Update. (Windows XP SP2 was installed after the USB update.) You connect the computer to one of the following docking stations or port replicators: ThinkPad Advanced Dock ThinkPad Advanced Mini Dock ThinkPad Essential Port Replicator You resume the computer from standby.
	Consider the following scenario: You connect an external USB TV tuner to a computer that is running Microsoft Windows XP Media Center Edition 2005. You disconnect the external USB TV tuner while you are watching Live TV. In this scenario, you may receive an exception error message on a blue screen.
	On a Microsoft Windows XP-based computer, you use a high-bandwidth USB 2.0 device, such as an isochronous video camera. However, after you repeatedly start and stop the USB device, it stops working correctly. This problem is more likely to occur on a system that has 256 megabytes (MB) of RAM or less. However, when the system is under heavy stress, this problem may also occur on a system that has more than 256 MB of RAM. When this problem occurs, you may receive an error message that resembles the following: Creation of the video preview failed. After this problem occurs, the USB device may be marked with a yellow exclamation point in Device Manager. Additionally, other USB 2.0 devices may not enumerate correctly, may not work correctly, or both.
	Consider the following scenario. You plug in a full-speed universal serial bus (USB) device to the Open Host Controller Interface (OHCI) controller on a Microsoft Windows XP Service Pack 2 (SP2)-based computer. You disable the OHCI controller, you disable the Enhanced Host Controller Interface (EHCI) controller, and then you re-enable the OHCI controller. In this scenario, the full-speed USB device that is connected to the OHCI controller is not enumerated.
	When several hard disks are connected to the universal serial bus (USB) ports of a computer that is running Microsoft Windows XP, the computer may stop responding when the Welcome screen appears.
	When you use a USB-to-Serial converter to connect a device to a Windows XP-based computer, the data transfer from the computer to the device is slower than expected. For example, assume that you connect a Windows Mobile-based device to a Windows XP-based computer through an "ActiveSync over serial" port. In this situation, the data transfer from the computer to the Windows Mobile-based device is much slower than the data transfer from the Windows Mobile-based device to the computer.
	You attach a USB-based device to a computer that is running Windows XP. Then, you try to scan for hardware devices. However, the computer may not detect the attached device, and you may not see the device in the My Computer folder. You may experience this problem when you are using one or more of the following devices: USB thumb drive (pen drive, flash drive) Apple iPod External hard disk drive Additionally, you may not see the iPod in the iTunes application.
	Consider the following scenario: You are running a Windows XP-based computer that has an NVIDIA 680i motherboard installed. You connect a keyboard to a USB port on the NVIDIA 680i motherboard. You restart the computer. In this scenario, the USB keyboard does not work. Additionally, a yellow exclamation mark (!) may appear next to the keyboard in Device Manager. If you disconnect and then reconnect the keyboard while Windows XP is running, the keyboard begins to work. However, this problem occurs again after you restart the computer.
	You do not receive notification when the USB bus is overloaded on a computer that is running Microsoft Windows Server 2003 or Microsoft Windows XP Professional x64 Edition. For example, you do not receive notification if the sum of the power requirements for the connected USB devices is more than the available power that the USB bus provides. Note If you have too many USB devices connected to the USB bus, one or more of these USB devices may not work. Also, if the overload condition causes a USB port failure, the system may stop responding or crash.
	A universal serial bus (USB) smart card reader that is connected to a Microsoft Windows Server 2003-based computer may not detect the smart card.
	When you try to put a Tablet PC that is running Microsoft Windows XP Tablet PC Edition 2005 into standby or into hibernation, it stops responding (hangs). This problem occurs when one or more USB composite devices that support selective suspension are installed.
	In Microsoft Windows XP, if an error occurs when the Hidusb.sys driver is reading from a USB human interface device, the driver tries to reset the device port by using an IOCTL_INTERNAL_USB_RESET_PORT I/O request. However, if the driver cannot reset the device port, no error is raised.
	Consider the following scenario: A universal serial bus (USB) device uses an interface association descriptor (IAD) to define a function that has multiple interfaces. This function uses the Usbser.sys driver file. In this scenario, the Usbser.sys driver may not load.
	When a Microsoft Windows XP-based computer tries to enter standby, the computer stops responding (hangs). This problem occurs when a driver tries to put a universal serial bus (USB) device into a Selective Suspend reduced-power state at the same time that Windows tries to enter standby. Specifically, this problem occurs because of a bug in the USB hub driver.
	After your computer resumes from hibernation, the Human Interface Device (HID) audio control keys on an attached Universal Serial Bus (USB) keyboard may not work. This problem does not occur if you move the mouse or press other keys on the keyboard after the computer resumes from hibernation before you press the audio control key (such as a volume control key).
	If you disconnect a Universal Serial Bus (USB) camera from your computer after you suspend and then resume the computer, the camera may remain in Device Manager. If Device Manager is running when you remove the camera, Device Manager may stop responding (hang) if you try to scan for new hardware. If Device Manager is not running when you remove the camera, Microsoft Management Console (MMC) may hang when you try to start Device Manager. This problem may occur under the following conditions: Your computer is compliant with the Advanced Configuration and Power Interface (ACPI) specification. Your computer supports USB. You connect a USB camera before you suspend the computer. This problem may occur if you connect the USB camera to a USB port on either a port replicator or a docking station.