Windows Resource Protection could not start the repair service

If you receive Windows Resource Protection could not start the repair service, when you go on to Run sfc /scannow or System File Checker in Windows 10/8/7, then this post may be able to help you.

Windows Resource Protection could not start the repair service

The System File Checker or sfc.exe is a utility in Microsoft Windows located in C:\Windows\System32 folder. This utility allows users to scan for and restore corrupt Windows system files.

But sometimes while running this tool, you may receive one of the following errors – and the tool will not be able to run or complete its job successfully.

  1. System File Checker SFC cannot repair corrupted member file
  2. Windows Resource Protection found corrupt files but was unable to fix some of them
  3. System File Checker not working, will not run or could not repair.

If this happens, you may try to Run System File Checker in Safe Mode or at Boot Time or repair the Windows Component Store using DISM and see if it works, or you may troubleshoot the errors individually, by following theĀ individual links.

Windows Resource Protection could not start the repair service

If you receive this error message, try this:

Run services.msc to open the Services Manager. Look for Windows Modules Installer or the TrustedInstaller service. Double-click on it and ensure that the Service is Started. If not press the Start button. Its startup type has to be set to Manual, by the way.

The Windows Modules Installer or TrustedInstaller service enables installation, modification, and removal of Windows updates and optional components. If this service is disabled, install or uninstall of Windows updates might fail for this computer. This service has full access to Windows Resource Protection files and registry keys and needs to be running in order to restore missing or corrupted system files.

Alternatively, you could open an elevated Command Prompt, type the following and hit Enter.

net start trustedinstaller

start trusted installer service

Once the service is started, run System File Checker and see if it works. If it still does not work, you may need to analyze its logs.

This post will show you how to how to Run sfc /scannow System File Checker on External Drives. See this post if you receive a There is a system repair pending which requires reboot to complete error message.

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Anand Khanse is the Admin of, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.