Click Start Orb and type cmd. In search results, right-click cmd and select Run as Administrator.
At the prompt, type sfc /scannow and press Enter. There is a space between "sfc" and "/scannow". This process make take a while.
If SFC find errors it cannot correct, it may ask you to insert your Windows CD.
If SFC finishes with errors, it will open a log in notepad. Copy the entire contents to your next reply.
Run Windows Update immediately if you had to use your Windows CD during this operation.
Restart your computer.