Hi. I own a 8400GS and i had Windows 7. I had random hang-ups and few seconds after, artifacts comes, but system still hanged-up. I can just restart the computer using power button. I though it was Windows 7 or something, so I formated and installed Windows XP pro and still happends. On desktop and during games. I dont think its overheating because the temp only shows 61 celcius idle, and it often hangs-up on idle. But when drivers are disabled, The systems doesnt hang at all. I tried installing a old driver and still hanging. Is my card is dying or....?