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How to scan and repair Windows virtual machine if its system files are corrupted

  • Parallels Desktop for Mac Home Edition


  • Windows performance is degraded.
  • Parallels Tools installation fails.
  • Virtual machine frequently crashes.
  • I am unable to install application in Windows.


Windows file system/registry corruption.


  1. Open Windows Start menu, in Search bar type cmd, right-click on the appeared Command Prompt application and choose Run as Administrator.

  2. In Command Prompt execute the command below:

    sfc /scannow    
  3. Wait for the scanning and the repairing processes to finish.

  4. There is a chance you might get the following message at the end of the scanning procesure:

        Windows Resource Protection found corrupt files but was unable to fix some of them. Details are included in the CBS.Log windir\Logs\CBS\CBS.log. For example C:\Windows\Logs\CBS\CBS.log. Note that logging is currently not supported in offline servicing scenarios


    It means that typical scanning/repairing utility is not enough to fix Windows files corruption, to be able to fix it, please do not close Command Prompt window and proceed with the instructions:

  5. In Command Prompt execute:

    DISM /Online /Cleanup-Image /RestoreHealth
  6. In case you have Windows installation media (CD/DVD disk or .iso image), please do the following:

  7. Make sure Windows is connected to the Internet.

  8. Insert CD/DVD or put .iso to the easiest Mac location to find.

  9. Actions > ....

  10. In Command Prompt execute:

    DISM /Online /Cleanup-Image /RestoreHealth


  11. Go to

    DISM /Online /Cleanup-Image /RestoreHealth /source:wim:D:\sources\install.wim:1 /limitaccess

    where D: is the Windows installation image mounted in a virtual drive.

    Wait until the operation is completed. This usually takes 20-30 minutes.

  12. Restart the virtual machine.

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