|When you boot up is it faulty also or only when logged on to your account? Try to boot to safe mode maybe.|
I'd suspect some failure in hardware but a live cd ought to prove it. If you have the Vista DVD boot to it just to see if it will boot to the repair features. If it fails then you know it is hardware.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.