Windows 7 Security center is not turning on

[khel2425]

Action center saying security center is not turned on, when i click on the button turn on it gives me an error message Windows cant turn on security center. When i check it on services.msc Security Center is not in the list. What should i do?

[JJ 3000]

Click start > all programs > accessories. Right click on command prompt and choose run as administrator. At the command prompt type sfc /scannow and press enter. This will run the system file checker. See if that makes any change.