VIA multi-core CPUs are not recognized correctly by Windows 7 or by Windows Server 2008 R2

Symptoms

You encounter one of the following issues on a Windows 7-based or a Windows Server 2008 R2-based computer that has a VIA multi-core CPU installed.

Issue 1

On a computer that is running a 64-bit version of Windows 7 or of Windows Server 2008 R2, Windows only recognizes two of the four cores in a quad-core CPU.

Issue 2

Windows recognizes cores as individual CPUs instead of a single CPU with multiple cores.

Issue 3

Windows does not recognize the extended model field in the following CPUID opcode:
Displayed Model = CPUID Leaf 1 EAX[19:16]<<4 + CPUID leaf 1 EAX[7:4]

Resolution

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 the problem described in this article. 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: 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 be running one of the following operating systems:
  • Windows 7
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2
  • Windows Server 2008 R2 Service Pack 1 (SP1)
For more information about how to obtain a Windows 7 or a Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    VersionProductSR_LevelService branch
    6.1.760
    0.
    16xxx
    Windows 7 and Windows Server 2008 R2RTMGDR
    6.1.760
    0.
    20xxx
    Windows 7 and Windows Server 2008 R2RTMLDR
    6.1.760
    1.
    17xxx
    Windows 7 and Windows Server 2008 R2SP1GDR
    6.1.760
    1.
    21xxx
    Windows 7 and Windows Server 2008 R2SP1LDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
File nameFile versionFile sizeDateTimePlatform
Ntkrnlpa.exe6.1.7600.167613,957,63217-Feb-201105:59Not applicable
Ntoskrnl.exe6.1.7600.167613,901,82417-Feb-201105:59Not applicable
Ntkrnlpa.exe6.1.7600.209033,966,84817-Feb-201106:24Not applicable
Ntoskrnl.exe6.1.7600.209033,911,55217-Feb-201106:24Not applicable
Ntkrnlpa.exe6.1.7601.175613,966,84817-Feb-201106:20Not applicable
Ntoskrnl.exe6.1.7601.175613,911,04017-Feb-201106:20Not applicable
Ntkrnlpa.exe6.1.7601.216613,966,84816-Feb-201106:17Not applicable
Ntoskrnl.exe6.1.7601.216613,911,04016-Feb-201106:17Not applicable
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Ntoskrnl.exe6.1.7600.167615,510,52817-Feb-201107:07x64
Ntoskrnl.exe6.1.7600.209035,475,20017-Feb-201107:04x64
Ntoskrnl.exe6.1.7601.175615,563,26417-Feb-201111:37x64
Ntoskrnl.exe6.1.7601.216615,561,72816-Feb-201107:43x64
Ntkrnlpa.exe6.1.7600.167613,957,63217-Feb-201105:59Not applicable
Ntoskrnl.exe6.1.7600.167613,901,82417-Feb-201105:59Not applicable
Ntkrnlpa.exe6.1.7600.209033,966,84817-Feb-201106:24Not applicable
Ntoskrnl.exe6.1.7600.209033,911,55217-Feb-201106:24Not applicable
Ntkrnlpa.exe6.1.7601.175613,966,84817-Feb-201106:20Not applicable
Ntoskrnl.exe6.1.7601.175613,911,04017-Feb-201106:20Not applicable
Ntkrnlpa.exe6.1.7601.216613,966,84816-Feb-201106:17Not applicable
Ntoskrnl.exe6.1.7601.216613,911,04016-Feb-201106:17Not applicable
For all supported IA-64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Ntoskrnl.exe6.1.7600.1676111,177,85617-Feb-201106:21IA-64
Ntoskrnl.exe6.1.7600.2090311,132,28817-Feb-201105:48IA-64
Ntoskrnl.exe6.1.7601.1756111,117,95217-Feb-201105:38IA-64
Ntoskrnl.exe6.1.7601.2166111,117,44016-Feb-201106:43IA-64
Ntkrnlpa.exe6.1.7600.167613,957,63217-Feb-201105:59Not applicable
Ntoskrnl.exe6.1.7600.167613,901,82417-Feb-201105:59Not applicable
Ntkrnlpa.exe6.1.7600.209033,966,84817-Feb-201106:24Not applicable
Ntoskrnl.exe6.1.7600.209033,911,55217-Feb-201106:24Not applicable
Ntkrnlpa.exe6.1.7601.175613,966,84817-Feb-201106:20Not applicable
Ntoskrnl.exe6.1.7601.175613,911,04017-Feb-201106:20Not applicable
Ntkrnlpa.exe6.1.7601.216613,966,84816-Feb-201106:17Not applicable
Ntoskrnl.exe6.1.7601.216613,911,04016-Feb-201106:17Not applicable

Status

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

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
File nameUpdate-bf.mum
File versionNot applicable
File size2,719
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameX86_235dcb7138ab58913cab89e6eca35fe7_31bf3856ad364e35_6.1.7600.20903_none_f8b67eb237026f45.manifest
File versionNot applicable
File size697
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameX86_4de71eb3891581e426405eba80cc2d6a_31bf3856ad364e35_6.1.7600.16761_none_f5a5b9a6164450a4.manifest
File versionNot applicable
File size697
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameX86_955278b9c4c8a2ac2881c3f8224a95d2_31bf3856ad364e35_6.1.7600.20903_none_babbd9db35ecb817.manifest
File versionNot applicable
File size717
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameX86_c56ee28767cf279e1e000bc0b3f9a83d_31bf3856ad364e35_6.1.7600.16695_none_406efe1b3dae8f29.manifest
File versionNot applicable
File size717
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameX86_cbb6f0c81448a3e0fd9a10b2ef9e5693_31bf3856ad364e35_6.1.7601.21661_none_f898f7e290848c21.manifest
File versionNot applicable
File size697
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameX86_cc2b5ff79f59e03c17ea386ec190b714_31bf3856ad364e35_6.1.7601.17561_none_3a35a8d14280bfb7.manifest
File versionNot applicable
File size697
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.16761_none_6c185e0c1569ff37.manifest
File versionNot applicable
File size16,151
Date (UTC)17-Feb-2011
Time (UTC)06:35
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20903_none_6ce4dcd92e552730.manifest
File versionNot applicable
File size16,151
Date (UTC)17-Feb-2011
Time (UTC)06:54
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.17561_none_6dfebb1212906b23.manifest
File versionNot applicable
File size16,151
Date (UTC)17-Feb-2011
Time (UTC)06:49
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21661_none_6e8857dd2bae0aed.manifest
File versionNot applicable
File size16,151
Date (UTC)16-Feb-2011
Time (UTC)06:45
PlatformNot applicable
File nameX86_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.16695_none_83c9857c8fc3c5d9.manifest
File versionNot applicable
File size8,047
Date (UTC)27-Oct-2010
Time (UTC)05:06
PlatformNot applicable
File nameX86_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.20903_none_84b274cba89a31ca.manifest
File versionNot applicable
File size8,047
Date (UTC)17-Feb-2011
Time (UTC)06:43
PlatformNot applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameAmd64_235dcb7138ab58913cab89e6eca35fe7_31bf3856ad364e35_6.1.7600.20903_none_54d51a35ef5fe07b.manifest
File versionNot applicable
File size699
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameAmd64_2b9d9e42b17114f07867316175c1b47f_31bf3856ad364e35_6.1.7600.16761_none_f12d50956e9f8217.manifest
File versionNot applicable
File size701
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameAmd64_4de71eb3891581e426405eba80cc2d6a_31bf3856ad364e35_6.1.7600.16761_none_51c45529cea1c1da.manifest
File versionNot applicable
File size699
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameAmd64_6865544e6c1633efe625b4a0dc4271ed_31bf3856ad364e35_6.1.7601.21661_none_8092b9ee4d9860ed.manifest
File versionNot applicable
File size701
Date (UTC)17-Feb-2011
Time (UTC)21:33
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File nameAmd64_79409b310c81886c21a26968da5ca39b_31bf3856ad364e35_6.1.7600.20903_none_919b82cc31649d90.manifest
File versionNot applicable
File size1,042
Date (UTC)17-Feb-2011
Time (UTC)21:33
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File nameAmd64_8293c45ff40afa98be305d95473799d1_31bf3856ad364e35_6.1.7601.17561_none_d115a8573ecfe8fe.manifest
File versionNot applicable
File size1,042
Date (UTC)17-Feb-2011
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File nameAmd64_a9314bbb5cf49d24c6092413013abe5d_31bf3856ad364e35_6.1.7601.17561_none_fa6c410bbe69b630.manifest
File versionNot applicable
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Date (UTC)17-Feb-2011
Time (UTC)21:33
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File nameAmd64_b07920b4fff778298e2f08a75fdb79b8_31bf3856ad364e35_6.1.7600.16761_none_15ec20dac30db015.manifest
File versionNot applicable
File size1,042
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameAmd64_b27a8289aa62b793bd8725c901930298_31bf3856ad364e35_6.1.7600.16695_none_c72f26069941735a.manifest
File versionNot applicable
File size721
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameAmd64_b4267be4a4c26d3ce141f3192a462e97_31bf3856ad364e35_6.1.7600.20903_none_8b56103bb4c919f5.manifest
File versionNot applicable
File size721
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameAmd64_cbb6f0c81448a3e0fd9a10b2ef9e5693_31bf3856ad364e35_6.1.7601.21661_none_54b7936648e1fd57.manifest
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File size699
Date (UTC)17-Feb-2011
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File nameAmd64_cc2b5ff79f59e03c17ea386ec190b714_31bf3856ad364e35_6.1.7601.17561_none_96544454fade30ed.manifest
File versionNot applicable
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Date (UTC)17-Feb-2011
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File nameAmd64_e10814bf5b12a96db96ee844d1a8ee34_31bf3856ad364e35_6.1.7600.20903_none_c685bc6b9cc688c6.manifest
File versionNot applicable
File size701
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameAmd64_f076529fed8edd5bcbfed4ce4d18c29e_31bf3856ad364e35_6.1.7601.21661_none_c7e43f02c46a9260.manifest
File versionNot applicable
File size1,042
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.16761_none_c836f98fcdc7706d.manifest
File versionNot applicable
File size15,291
Date (UTC)17-Feb-2011
Time (UTC)07:51
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20903_none_c903785ce6b29866.manifest
File versionNot applicable
File size15,291
Date (UTC)17-Feb-2011
Time (UTC)07:51
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.17561_none_ca1d5695caeddc59.manifest
File versionNot applicable
File size15,291
Date (UTC)17-Feb-2011
Time (UTC)12:13
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21661_none_caa6f360e40b7c23.manifest
File versionNot applicable
File size15,291
Date (UTC)16-Feb-2011
Time (UTC)08:09
PlatformNot applicable
File nameAmd64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.16695_none_dfe821004821370f.manifest
File versionNot applicable
File size8,049
Date (UTC)27-Oct-2010
Time (UTC)06:02
PlatformNot applicable
File nameAmd64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.20903_none_e0d1104f60f7a300.manifest
File versionNot applicable
File size8,049
Date (UTC)17-Feb-2011
Time (UTC)07:36
PlatformNot applicable
File nameUpdate-bf.mum
File versionNot applicable
File size3,153
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.16761_none_6c185e0c1569ff37.manifest
File versionNot applicable
File size16,151
Date (UTC)17-Feb-2011
Time (UTC)06:35
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20903_none_6ce4dcd92e552730.manifest
File versionNot applicable
File size16,151
Date (UTC)17-Feb-2011
Time (UTC)06:54
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.17561_none_6dfebb1212906b23.manifest
File versionNot applicable
File size16,151
Date (UTC)17-Feb-2011
Time (UTC)06:49
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21661_none_6e8857dd2bae0aed.manifest
File versionNot applicable
File size16,151
Date (UTC)16-Feb-2011
Time (UTC)06:45
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
File nameIa64_14bca010b92456ed4acdf6d40a0aac49_31bf3856ad364e35_6.1.7600.20903_none_e9cb054e48ee8dff.manifest
File versionNot applicable
File size699
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameIa64_235dcb7138ab58913cab89e6eca35fe7_31bf3856ad364e35_6.1.7600.20903_none_f8b822a837007841.manifest
File versionNot applicable
File size698
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameIa64_4984311a0e85f4ee933b0907d9320de5_31bf3856ad364e35_6.1.7600.16695_none_8d7e4cb96bf06786.manifest
File versionNot applicable
File size719
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameIa64_4de71eb3891581e426405eba80cc2d6a_31bf3856ad364e35_6.1.7600.16761_none_f5a75d9c164259a0.manifest
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Date (UTC)17-Feb-2011
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Date (UTC)17-Feb-2011
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Date (UTC)17-Feb-2011
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File nameIa64_cbb6f0c81448a3e0fd9a10b2ef9e5693_31bf3856ad364e35_6.1.7601.21661_none_f89a9bd89082951d.manifest
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Date (UTC)17-Feb-2011
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Date (UTC)17-Feb-2011
Time (UTC)21:33
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File nameIa64_dcbf9fa1a54cdb4dd7e718e40058b7d0_31bf3856ad364e35_6.1.7601.17561_none_cdfaeb50cd21910e.manifest
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Date (UTC)17-Feb-2011
Time (UTC)21:33
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File nameIa64_ed64ca869c6fa3dd832213a27b8b3560_31bf3856ad364e35_6.1.7600.20903_none_d2b37b9b9f4ae045.manifest
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File size719
Date (UTC)17-Feb-2011
Time (UTC)21:33
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File nameIa64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.16761_none_6c1a020215680833.manifest
File versionNot applicable
File size15,289
Date (UTC)17-Feb-2011
Time (UTC)07:24
PlatformNot applicable
File nameIa64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20903_none_6ce680cf2e53302c.manifest
File versionNot applicable
File size15,289
Date (UTC)17-Feb-2011
Time (UTC)07:47
PlatformNot applicable
File nameIa64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.17561_none_6e005f08128e741f.manifest
File versionNot applicable
File size15,289
Date (UTC)17-Feb-2011
Time (UTC)07:38
PlatformNot applicable
File nameIa64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21661_none_6e89fbd32bac13e9.manifest
File versionNot applicable
File size15,289
Date (UTC)16-Feb-2011
Time (UTC)07:42
PlatformNot applicable
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File versionNot applicable
File size8,048
Date (UTC)27-Oct-2010
Time (UTC)05:57
PlatformNot applicable
File nameIa64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.20903_none_84b418c1a8983ac6.manifest
File versionNot applicable
File size8,048
Date (UTC)17-Feb-2011
Time (UTC)07:39
PlatformNot applicable
File nameUpdate-bf.mum
File versionNot applicable
File size2,128
Date (UTC)17-Feb-2011
Time (UTC)21:33
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.16761_none_6c185e0c1569ff37.manifest
File versionNot applicable
File size16,151
Date (UTC)17-Feb-2011
Time (UTC)06:35
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20903_none_6ce4dcd92e552730.manifest
File versionNot applicable
File size16,151
Date (UTC)17-Feb-2011
Time (UTC)06:54
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File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.17561_none_6dfebb1212906b23.manifest
File versionNot applicable
File size16,151
Date (UTC)17-Feb-2011
Time (UTC)06:49
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File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21661_none_6e8857dd2bae0aed.manifest
File versionNot applicable
File size16,151
Date (UTC)16-Feb-2011
Time (UTC)06:45
PlatformNot applicable

References

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.
プロパティ

文書番号:2502664 - 最終更新日: 2011/04/13 - リビジョン: 1

Windows 7 Enterprise, Windows 7 Home Premium, Windows 7 Professional, Windows 7 Ultimate, Windows 7 Home Basic, Windows 7 Starter, Windows Server 2008 R2 Standard, Windows Server 2008 R2 Enterprise, Windows Server 2008 R2 Datacenter, Windows Server 2008 R2 Foundation, Windows Server 2008 R2 for Itanium-Based Systems

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