Answer
This question was answered on May 10, 2006.
Much of the information contained herein may have changed since posting.
If you didnt know, all catalyst drivers put out for whatever family of video card ( Radeon, All-In-Wonder, FireGl, etc ) work for the whole family of video cards.
Since ATI does not allow direct linking go to ati.com, click on the Drivers & Software button up top, select Windows XP Drivers and Software, select Radeon, select "Catalyst 6.4 Windows XP - Driver Download", and that will take you to a page with the different driver and software package downloads. The minimum you require would be the "Display Driver Only" download under the "Low Speed (Dial-up)" area.