In the command prompt window type
dism /online /cleanup-image /restorehealth, and press Enter.
During the scan you will see the following progress indicator,
Wait for the process to complete. You will be informed in the same window if any integrity violations have been found and if they have been fixed. An example of what the message would look like if issues were detected and repaired.
A reboot of your computer is recommended if any repairs have been performed.