Hi.
Check this link, it is to run (Scannow and Dism) that are used to repair Windows system files.
https://support.microsoft.com/en-us/help/929833...
If the above does not work, you can go back to a previous point in Windows.
Follow the steps below to restore your computer to a previous date using a restore point:
1- Type recovery in the search box of the taskbar and choose Recovery (Control Panel).
2.- Click on Open System Restore.
3.- Click on Next.
4.- Select your restore point, and click Next.
5.- Click on Finish.
The computer will reboot and present a message on the desktop confirming that the restoration was successful.