Windows Resource Protection could not start the repair service is quite a normal error to receive when attempting to start a System File Checker scan. The problem is caused by trustedinstaller service not running properly.

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Resolving this problem

Method 1: Using Services.msc

1. Press the Windows + R key on your keyboard at the same time and then type services.msc and hit enter.

2. Then find Windows Modules Installer or TrustedInstaller and doubleclick it.

3. Now click the Start button.

 

Then try to run SFC again and see if it now works.

Method 2: Using Elevated Command Prompt

1. Start an Elevated Command Prompt (Run as Admin)

2. Enter the following command:

net start trustedinstaller

3. Hit enter.

 

Now try to run SFC again and see if it now works.