At the command prompt, type the following command, and then press ENTER:
sfc /scannow
The sfc /scannow command will scan all protected system files, and replace corrupted files with a cached copy that is located in a compressed folder at %WinDir%System32dllcache.
The %WinDir% placeholder represents the Windows operating system folder. For example, C:Windows.
Note Do not close this Command Prompt window until the verification is 100% complete. The scan results will be shown after this process is finished.