System File Checker

System File Checker, or 'SFC' for short, is a built-in Windows tools that checks for system files that may be corrupt or missing.

Running a Command Prompt

For Windows 8 or above:

  1. Go to "Start" and search "cmd"
  2. At the first option, "cmd" right click it and in the bottom menu choose "Run as an administrator"
  3. You may receive a UAC prompt; confirm it.

For Windows Vista or Windows 7:

  1. Go to "Start" and search "cmd"
  2. Right click on the first item and press "Run as an administrator".
  3. You may receive a UAC prompt; confirm it.

Running System File Checker

Once you've opened an administrative Command Prompt window, run the command: sfc /scannow.

Your window should be similar to this:

Press Enter and let the command run, this will take a while. When the scan is complete, you are given results through the command-line window.

After this is complete, restart the computer.