ATI drivers are a hassle to install and tend to be unstable! I've tried their lastest with bad luck! This is RADEON. XP accepts this driver from its setup file.
When you reboot, hit F8 and choose VGA mode. Answer yes for windows to adjust.
Reboot again! You may need to adjust resolution. Right-click ATI icon by clock and click display settings.
Hydravision is available at WWW.ATi.com but you must pick product model and enter there. I found the beta version to be more stable.