I'm sorry that you've waited so long for a response. If you're still having th problem, try this - if it doesn't work we'll think again:-
Press the Windows key plus the X key on your keyboard, a dialogue box will appear.
Look down the list and select 'Command Prompt (Admin)'
When the command prompt appears, type:- sfc /scannow and hit enter. When the scan has finished, restart your computer, and keep your fingers crossed.
Post back here if it doesn't solve the problem.