If I could just add my two pennorth
All that Mucks says is correct. When I had an NVidia card I used that refresh tool and it worked fine. I then changed my Monitor and it was recognised as a 'Plug & Play' by XP.
This led to some weird and wonderful sights during gaming. A quick zoom over to Iiyama's site and the downloading of the correct drivers sorted out all problems. Those Iiyama drivers, BTW, were not approved by XP.
There again, you could always go out and get yourselves a Radeon Card, no probs and now, at last, excellent driver support