Sysprep was not able to validate your Windows installation. Review the log file at %WINDIR%\System32\Panther\setupact.log for details. After resolving the issue, use Sysprep to validate your installation again.


When trying to sysprep Windows 10 you get the error

Sysprep was not able to validate your Windows installation. Review the log file at %WINDIR%\System32\Panther\setupact.log for details. After resolving the issue, use Sysprep to validate your installation again.






  • Check the log file, and see if you have a package installed that's blocking sysprep.

    "2020-02-25 00:01:27, Error                 SYSPRP Package Microsoft.LanguageExperiencePacken-GB_18362.14.45.0_neutral__8wekyb3d8bbwe was installed for a user, but not provisioned for all users. This package will not function properly in the sysprep image."

  • Determine the name of the package

    Get-AppxPackage -AllUsers | SELECT PackageFullName, Name

  • Remove the package

    Get-AppxPackage -AllUsers "Microsoft.LanguageExperiencePacken-GB"|Remove-AppXPackage -AllUsers

  • Run sysprep again

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