I'll be honest, I am not sure how or why I would do that? I cant have both cards running at the same time?
I have had 2 cards at the same time, Once
My mother board would not see the PCI slot one . I do not know why.
I put the agp one in and it saw it. ( no on board video)
I then installed the PCI and loaded the driver
It saw the agp and pci. I then took out the agp.
I needed the agp card for another PC becouse it has 2 VGA out puts and a svid out.
do you have another PC to try the cards in?
have you tried moving to another PCI slot?
to get to the bios.
Most my PC are hit F8 at boot up
or some say hit delete to enter setup
find your on board video and turn it off.
F10 = save and exit
if all is good on the card you should be fine.
XP really sould not be giving you problems on your card.
I am starting to think there is something wrong with the card.
XP Pro service pack 1 is not a hard disk to track down.