My windows security center will not turn on. When I try to turn it on it says that it cannot be started. Also when I attemted to trouble shoot , I found that windows security center is not in my services.
More aboutturn window security service
If you have multiple antiviruses installed sometimes they can conflict with this.
Check here for one solution to that exact problem. Basically you want to set the windows security service to automatic.
I agree with wanamingo and also try to run sfc. you can do this by going to start>type in cmd>right-click on the black cmd icon and run as administrator. a box will pop up. type in "sfc /scannow" without the quotes.