1. remove the card from the computer
2. uninstall all AMD/ATI drivers
3. Redownload the drivers from http://support.amd.com/us/gpudownload/windows/Legacy/Pages/radeonaiw_xp.aspx
Or use the disc provided from the graphics card box
4. turn off the computer, plug the card back in
5. boot and install the drivers
if that doesnt work then im afraid it might be a hardware problem....