I had the HUTIL(the samsung hard drive tool) program erase everything on the hard drive, there was only games and some holiday photos, which had alrealy been backed-up, so nothing important was lost. I have reinstalled windows and everything is back to normal. I ran the CHKDSK program a few times and it did not find anything wrong, however I think I will buy a second hard drive just to be on the safe side.

The graphics problem is still there. I have tried changing the monitor and they still happen, so I think it is the graphics card that is the problem. I did all the tests on the dxdiag tool, and there where all fine. Are there any other tests that I can do?