Consider the following scenario. You are running Windows Vista or Windows Server 2008 on a computer that has multi-core processors. A driver on the computer calls the MmProbeAndLockPages routine asynchronously. In this scenario, data corruption may occur.

This problem occurs randomly. It typically occurs when the following conditions are true:

• The computer has some graphics processing devices installed.
• You are running a graphics-intensive application.

When this problem occurs, the system or the application may crash. The actual symptoms vary, depending on the specific drivers that are installed on the computer.

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Consider the following scenario:

• You have a computer that uses a multicore processor. The number of the cores on a socket is not a power of 2. For example, the computer has a 6-core processor.
• You install an x86-based version of Windows Server 2008 or an x86-based version of Windows Vista on the computer.

In this scenario, you experience the following problems:

• When you check the number of processors in some user interfaces, such as in Task Manager, the number that is displayed is lower than the actual number.
• Performance of the computer is lower than expected.

Note: These problems occur only on an x86-based version of Windows Server 2008 and on an x86-based version of Windows Vista.

Consider the following scenario:

• On a multiprocessor system, you encode a multi-bitrate (MBR) video by using one of the following:
  • Windows Media Encoder 9 Series
  • An application that is based on the Windows Media Format SDK

You compress the video by using one of the following:

• The Windows Media Video v9 codec
• The Windows Media Video 9 Advanced Profile codec

On a multiprocessor computer that is running Windows Vista, the Rasdial API may free the same memory two times. When this problem occurs, the dial-up application stops responding (hangs).

Consider the following scenario:

• You have a Windows Vista-based computer that has multiple processors, such as a dual-core processor. Or, the computer has a hyperthreading-enabled processor.
• You run a program that uses the waveOutWrite function.

In this scenario, the waveOutWrite function returns the following error message:

MMSYSERR_NODRIVER

The waveOutWrite function continues to return this error message until you exit the program. Additionally, audio playback does not work as expected when you run the program.

On an Intel Ultra Mobile Platform-based computer that is running Windows Vista, the Windows System Assessment tool (Winsat.exe) displays incorrect processor information. Therefore, the Windows Experience Index score is lower than the actual score.

Note: The code name for Intel Ultra Mobile Platform is “McCaslin.”

For example, you open a command prompt by using an administrator account. Then, you run the WinSAT.exe –v command at the command prompt. The processor cache size that appears in the command output is not consistent with the processor cache size that is described in the processor’s product documentation.

You change the processor, or CPU, on a Windows Vista-based computer. However, Device Manager still shows information for the previous processor. Device Manager is not updated to show information for the new processor. For example, the brand string may not be correct. For information about how to contact your hard drive manufacturers, click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:
65416 Hardware and software vendor contact information, A-K

60781 Hardware and software vendor contact information, L-P

60782 Hardware and software vendor contact information, Q-Z
The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.