System File Checker is an administrative repair tool that comes built into the Windows operating systems. It’s one of many things that we use on a daily basis to find and fix issues when windows becomes corrupted.
To use this tool, you can use either the search box or press the Windows key and s at the same time. Then type in CMD and hit enter. When you see the command tool, right-click and select to run as administrator. Once the black command prompt window opens, type sfc /scanner and hit enter.
The repair process should usually take a few minutes and in most cases, it will confirm that corrupt system files have been repaired or that there were no integrity violations. In the rare event that corrupt files are found that can’t be repaired, it may be time to take further action, including considering a fresh reinstall of Windows