You beat me to it there
ooooh, wait a minute, it could be an HD error.
bad sectors FTL? run chkdsk and reboot, let windows run through all the bullcrap and scan the HD for errors...maybe itll help, it sure as hell is worth a shot, right?
who, what, when?
hmmm.....
do you have your vista disc, or an XP disc?
i know you can run chkdsk off of the XP disc, although im not sure about vista. just set your BIOS boot order to load the CD first, HD second.
did you reinstal the grafics drivers yet?