Run with your anti-virus program you have installed. Make sure your system is clean.
Run a system file check. See if it catches any corrupted files and be able to repair them.
Start button - search box type cmd - look up, RIGHT click on cmd.exe - click Run As Administrator - in that black and white cmd window, type at the flashing prompt sfc /scannow - press ENTER key. Note : there is a Space between "sfc" and "/". Sit back and wait. It will take some time. When done, exit cmd window. Reboot ( re-start your computer )