When i started up the computer, it will load past the windows 7 logo then when it comes to the desktop, it would load for 2 seconds or so then it would just restart. The desktop is blank, the only thing visible is the mouse cursor. After seconds of viewing the blank screen, it just restarts and it repeats itself. Startup repair doesn't work either, it says it has failed to do the automatic repairs. I cannot boot into any kind of mode as well, safe mode doesn't work. last configuration mode doesn;t work either. All of the modes results in the same restarts, I would see a blank desktop with the mouse cursor in the middle then it restarts. I haven't done any changes to the computer recently, it was working fine in the morning then all of a sudden, this problem occured in the the afternoon. I've unplugged all hardware and tried starting up with just a ps/2 mouse and keyboard, but the problem still persists. I've also ran memtest86, and I passed all the tests, no error, so I guess the ram could be eliminated. Could this be an hardware issue or an virus? I don't want to resort to formatting because all my work is in there. I've only owned this computer a little more than a month. It's an acer desktop with amd anthlon 2.7, nvidia geforce 9200 and windows 7 home premium 64bit. Any input on this matter would be greatly appreciated.