Please follow the below steps and keep us posted on the status .
Click on start and click on start search
In the open prompt type : cmd
From the options above , right click on cmd and select Run as administrator
In the command prompt window , type CHKDSK /F and press enter
This would help you complete and check disc on your operating system files .
Please let us know if the above reported any bad sectors on any drive , (Note : You might be prompted to restart the PC )
Please right Click on the "M" icon on the bottom right part of the screen(it should be in hidden icons if you are using windows7) and click on check for updates and restart your computer it should work normally this happens if DAT version is not up to date