Consider the following scenario:

•	You are running a Windows XP-based computer that is using an AMD chipset.
•	You connect a USB Webcam to the computer.

In this scenario, you may experience severe degradation in the video output of both the Webcam and other video-based programs. You may also experience a Stop error on a blue screen. This problem occurs when the output resolution of the Webcam is set to 960 by 720 pixels or to a higher resolution.

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Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must have Windows XP Service Pack 2 (SP2) or a later service pack installed. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

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 XP with Service Pack 2, x86-based versions

File name	File version	File size	Date	Time	Platform	SP requirement
Usbehci.sys	5.1.2600.3358	30,336	24-Apr-2008	09:15	x86	SP2
Usbohci.sys	5.1.2600.3358	17,152	24-Apr-2008	09:15	x86	SP2
Usbport.sys	5.1.2600.3358	144,128	24-Apr-2008	09:15	x86	SP2
Usbuhci.sys	5.1.2600.3358	20,608	24-Apr-2008	09:15	x86	SP2

Windows XP with Service Pack 3, x86-based versions

File name	File version	File size	Date	Time	Platform
Usbehci.sys	5.1.2600.5587	30,336	24-Apr-2008	11:11	x86

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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This problem also occurs in Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base: For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: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.

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