welcome to the forums dude. as for your problem, i see two possibilities. either your power supply isn't supplying enough power for your video card, or your computer may be full of viruses and the like. first, do a spyware and virus scan and see if it picks anything up. if still no luck, consider reformatting and reinstalling windows. or if you prefer not to do that, buy a better power supply and see if that helps. it definitely won't hurt to get a new one.