A Microsoft Windows Server 2003-based or Microsoft Windows XP-based computer that is using a dual core or multiprocessor Advanced Micro Devices (AMD) processor that supports ACPI processor performance states (AMD PowerNow!) may stop responding. This problem is most likely to occur when you run a video-intensive program. However, this problem can occur whenever there is a processor performance state change.

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This problem occurs because of a deadlock in the kernel power manager. This deadlock occurs because of a race condition that can occur when the processor performance state is changed on an AMD processor.

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The following files are available for download from the Microsoft Download Center:

Update for Windows XPDownload the KB924441 package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=B0FF829D-C427-4F40-BC56-F481837EFFBE)

Update for Windows Server 2003Download the KB924441 package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=FFBD23C0-BF9C-4F0D-8F1C-F222F0A9402B)

Update for Windows x64 Edition Download the KB924441 package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=990BA8A0-A2BE-468B-B105-B6D6E0DD7CE1)

Release Date: December 19, 2006

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

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Windows Server 2003 update information

Prerequisites

To apply this update, the computer must be running one of the following operating systems:

•	A 32-bit version of Windows Server 2003 with Service Pack 1 (SP1)
•	An x64-based version of Windows

Restart requirement

You must restart your computer after you apply this update.

Update replacement information

This update does not replace a previously released update.

File information

The English version of this update 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 Server 2003, 32-bit (x86-based) versions

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Ntkrnlmp.exe	5.2.3790.2794	2,459,648	16-Sep-2006	09:35	Not Applicable	SP1	SP1QFE
Ntkrnlpa.exe	5.2.3790.2794	2,271,232	16-Sep-2006	09:00	x86	SP1	SP1QFE
Ntkrpamp.exe	5.2.3790.2794	2,311,680	16-Sep-2006	09:00	Not Applicable	SP1	SP1QFE
Ntoskrnl.exe	5.2.3790.2794	2,419,712	16-Sep-2006	09:34	x86	SP1	SP1QFE

Windows Server 2003, x64-based versions

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Ntkrnlmp.exe	5.2.3790.2794	4,627,456	16-Sep-2006	13:17	x64	SP1	SP1QFE
Ntoskrnl.exe	5.2.3790.2794	4,482,560	16-Sep-2006	13:17	x64	SP1	SP1QFE

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Windows XP update information

File information

The English version of this update 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, 32-bit (x86-based) versions

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Ntkrnlmp.exe	5.1.2600.3014	2,137,600	12-Oct-2006	12:26	x86	SP2	SP2QFE
Ntkrnlpa.exe	5.1.2600.3014	2,059,136	12-Oct-2006	11:45	x86	SP2	SP2QFE
Ntkrpamp.exe	5.1.2600.3014	2,017,280	12-Oct-2006	11:45	x86	SP2	SP2QFE
Ntoskrnl.exe	5.1.2600.3014	2,181,888	12-Oct-2006	12:28	x86	SP2	SP2QFE

Windows XP, 64-bit versions

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Ntkrnlmp.exe	5.2.3790.2794	4,627,456	16-Sep-2006	13:17	x64	SP1	SP1QFE
Ntoskrnl.exe	5.2.3790.2794	4,482,560	16-Sep-2006	13:17	x64	SP1	SP1QFE

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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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For more information, click the following article number to view the article in the Microsoft Knowledge Base: For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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Technical support for x64-based versions of Microsoft Windows

If your hardware came with a Microsoft Windows x64 edition already installed, your hardware manufacturer provides technical support and assistance for the Windows x64 edition. In this case, your hardware manufacturer provides support because a Windows x64 edition was included with your hardware. Your hardware manufacturer might have customized the Windows x64 edition installation by using unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you need technical help with a Windows x64 edition. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware. If you purchased a Windows x64 edition such as a Microsoft Windows Server 2003 x64 edition separately, contact Microsoft for technical support.

For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site: For product information about x64-based versions of Microsoft Windows Server 2003, visit the following Microsoft Web site: The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

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