Tim,
 
I have a Windows XP system with a Radeon 9600 XT AGP card.  Fractint works fine with it.
 
As an aside, you may recall that many people on this list, including you, tried to help me with a problem I had when I first got the card.  Fractint would not give me any resolutions over 640 X 480.  Nothing I tried helped. 
 
However, I recently purchased a new monitor.  It's a SyncMaster 173P LCD display.  I can now get resolutions up to 1280 X 1024.  My previous SONY monitor was certainly capable of the handling these resolutions, so I don't know why changing the monitor should have had an effect.  Maybe this will give you some ideas about your own situation, though.
 
Bill Rossi
http://members.aol.com/billatny/
http://www.arts4u.org/rossi/