When you attempt to run the System File Checker (sfc.exe /scannow command) to restore missing or corrupted system files, the following error message may appear:

Windows File Protection could not be initiate a scan of protected system files.
The specific code is 0x000006ba [The RPC Server is unavailable.]

This usually happens if the Windows File Protection (WFP) is disabled in the registry.

Enable the System File Checker in the Registry

Use the following steps to re-enable WFP.

  1. Click Start, Run. Type Regedit.exe and press ENTER.
  2. Navigate to the following branch:

    HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion \ Winlogon

  3. Double-click SFCDisable and set its Value data to 0
  4. Exit the Registry Editor and restart Windows.