Hold on ... let me get this staight...
The PC will start up and the driver version shows up at BIOS start so the card is working fine right now. And when the windows icon comes up , for loading , (little blue scroller for XP) it runs fine now right after tat part it stops working?
are your system specs up to the job?
Do you have enough RAM?
Overheat on the Card?
Hard Disc damage ?
Itseems that the hard disc may be faulty if everything else is in order (sytem specs , heat). I thik that if you have bashed your PC around or subjected it to high static that you might have broken the hard disc. You might end up having to buy a new Hard disc and operating system if that is the case.
mabybe there is an incompatability with your computer's software and hardware? If you run some ancient tech now (windows ME or lower probably) then something might not like it.
Have you change d anthing else since installing the card or before installation that you would consider sigificant? Any unexpected slowdowns, shutdowns ?
Have you perhaps ran ovr your PC with a steamroller?