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The number of physical hyperthreading-enabled processors or the number of physical multicore processors is incorrectly reported in Windows XP
Article ID: 936235 - View products that this article applies to.
When either of the following conditions is true for a Windows XP-based computer, Windows incorrectly reports the number of physical processors:
This issue occurs because Windows XP does not have the functionality to detect hyperthreading processors and multicore processors. This functionality was introduced in Windows Vista by using the Win32_ComputerSystem class and the Win32_Processor class in Windows Management Instrumentation (WMI).
A hotfix is available to resolve this problem. After you apply this hotfix, the behavior of the Win32_ComputerSystem and Win32_Processor classes in Windows XP is the same as the behavior of these two classes in Windows Vista.
Hotfix informationA 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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
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, contact 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:
http://support.microsoft.com/contactus/?ws=supportNote 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.
PrerequisitesTo apply this hotfix, you must have Windows XP Service Pack 2 (SP2) installed on the computer.
Restart requirementYou have to restart your computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace any other previously released hotfixes.
Registry informationTo use this hotfix, you do not have to make any changes to the registry.
File informationThe 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 SP2, 32-bit version
Collapse this tableExpand this table
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Before you apply this hotfix, the WMI classes and the WMI properties exhibit the following behavior.
For example, assume that a dual-processor system contains two processors that are each enabled for hyperthreading. This system can run four threads or four programs at the same time. In this case, the value of the NumberOfCores property is 2, and the value of the NumberOfLogicalProcessors property is 4.
For more information about the Win32_ComputerSystem class, visit the following Microsoft Web site:
http://msdn2.microsoft.com/en-us/library/Aa394102.aspxFor more information about the Win32_Processor class, visit the following Microsoft Web site:
http://msdn2.microsoft.com/en-us/library/aa394373.aspxFor more information about these two classes in Windows Vista, visit the following articles in Microsoft Web site:
http://www.microsoft.com/technet/scriptcenter/topics/vista/wmi1.mspxFor more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates
(http://support.microsoft.com/kb/932370/ )The number of physical hyperthreading-enabled processors or the number of physical multicore processors is incorrectly reported in Windows XP and in Windows Server 2003