Hey Tara,
your problem could lie in either one or two problems
Firstly, although you've got a kick-ass CPU, your video card sux.
Secondly, for a RAM hungry game like GP4, you'll need a lot more than 128 Mb of main RAM.
Thirdly, you're running WinXP, so you're at a disadvantage anyway.
Solution, and I hope this will help:
Try and download the latest video card drivers from ATI
if that doesn;t work, try clicking on this link for superfast GP4
[
www.grandprix3.com]
and try to put more ram in your pc
if t hat doesn't work, post another "Please HELP" message on the forum.
The only thing that helps me maintain my slender grip on reality is the friendship I share with my collection of singing potatoes.