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Simonx Xu
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Merge pull request #7952 from MicrosoftDocs/repo_sync_working_branch
Confirm merge from repo_sync_working_branch to main to sync with https://github.com/MicrosoftDocs/SupportArticles-docs (branch main)
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support/windows-server/performance/rebuild-performance-counter-library-values.md

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title: Rebuild performance counter library values
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description: This article describes how to manually rebuild performance counter library values.
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ms.date: 12/26/2023
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ms.date: 12/31/2024
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manager: dcscontentpm
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audience: itpro
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ms.topic: troubleshooting
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To rebuild the base performance counter libraries manually, follow these steps:
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1. Expand the *Perfc009.dat* file and the *Perfh009.dat* file. These files are located on the Windows Installation Disc. The compressed files are found at `DriveLetter:\i386\perfc009.da_` and at `DriveLetter:\i386\perfh009.da_`. Replace the files that are in the `%Systemroot%\System32` folder.
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1. Expand the *Perfc009.dat* file and the *Perfh009.dat* file. These files are located on the Windows Installation Disc. After mounting the Windows Installation Disc (.wim) file by using PowerShell cmdlets or by using the `Dism` command, the compressed files are found at `DriveLetter:\i386\perfc009.da_` and at `DriveLetter:\i386\perfh009.da_`. Replace the files that are in the `%Systemroot%\System32` folder.
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2. Start Registry Editor, and then locate the following key in the registry:
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`HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Perflib`

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