Microsoft KB Archive/941996

= A USB device may not work when you start a Windows Vista-based computer or when you wake the computer from sleep =

Article ID: 941996

Article Last Modified on 10/19/2007

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APPLIES TO


 * Windows Vista Ultimate
 * Windows Vista Enterprise
 * Windows Vista Business
 * Windows Vista Home Premium
 * Windows Vista Home Basic
 * Windows Vista Starter
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Enterprise 64-bit Edition
 * Windows Vista Business 64-bit Edition
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Home Basic 64-bit Edition

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The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.



SYMPTOMS
When you start a Windows Vista-based computer, or when you wake the computer from sleep, a USB-connected device may not be recognized correctly. Because of this problem, you may experience any of the following issues:
 * A USB-based fingerprint reader may be unavailable for use at the Welcome screen. Therefore, you cannot log on to the computer by using the fingerprint reader.
 * A USB-based keyboard may be unavailable for use.
 * A USB-based mouse may be unavailable for use. The mouse pointer does not appear.

Note A wireless keyboard or a wireless mouse may communicate with a wireless receiver that is connected to a USB port.
 * A USB-based near field communication device (FeliCa) cannot be resumes from an S3 Sleep State (Standby).

This problem may occur only occasionally.

Note Certain USB devices may be integrated into the system, and they may be connected to an internal hub. For example, a portable computer may have a single USB bus. In this situation, the computer may use an internal USB hub to make two or more USB ports available on the computer.



Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
No prerequisites are required.

Restart requirement
You must restart your computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace a previously released hotfix.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista, 64-bit versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Keywords: kberrmsg kbtshoot kbbug kbfix kbqfe kbexpertisebeginner kbhotfixserver kbwinvistapostrtmfix KB941996

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