Fix Windows corruption errors by using DISM or System Update Readiness Tool - GWXUX.exe - Application Error

Repairing files. To do so, refer to the steps below:

1. Open the start page and type "cmd"
2. Right click on the command prompt and click on "Run as administrator".
3. Type the following commands and hit enter after each.

DISM.exe /Online /Cleanup-image /Scanhealth

DISM.exe /Online /Cleanup-image /Restorehealth

https://support.microsoft.com/en-us/kb/947821

Alternative way: 

Performing a SFC Scan and check if it helps.

Refer to the following link given below.
https://support.microsoft.com/en-us/kb/929833