Well, to check Windows side of things... Open a command prompt, as admin and run the command: sfc /scannow <----- this will check the Windows files for you.
It might also be your vid card driver...
DDU Instructions - Nvidia/AMD1. Get this program, here:
http://www.wagnardmobile.com/forums/viewtopic.php?f=5&t=144 ...from the "Official Download Here" link, and save it to your desktop.
2. Get your vid card driver here, use the
Manual Search: Nvidia:
http://www.geforce.com/drivers ...or AMD:
http://support.amd.com/en-us/download ...save this to your desktop.
3. Run DDU (Display Driver Uninstaller) choose: Nvidia or AMD, then choose the "Highly Recommend Option", and just do what it tells you. If it wants to go into "Safe Mode", let it.
4. After it's done and comp has rebooted to normal mode, just double click the Nvidia or AMD driver ( that you saved to your desktop in step #2) ...to install. If it want's to reboot, let it.