System File Checker is a utility in Microsoft Windows that allows users to scan for and restore corruptions in Windows system files.
SFC scan is extremely simple...and everyone must be able to run it now and then. Seriously.
Click start > click All Programs > Click Accessories > Right click on Command prompt, then > click run as administrator. A dark-background window will pop up. Right next to the white blinkiing - (dash or minus sign), type sfc /scannow, then press enter.
Make sure you press space bar once after typing sfc before typing /scannow.
Typed incorrectly (without pressing space bar once) it will look = sfc/scannow.
If typed correctly (with pressing space bar once), it should look= sfc /scannow.
Scan takes several minutes. While scan is running you may use your pc as usual. When scan is completed, restart pc.