Tak si zadej do Google: ati uninstall
Najde toho dost, třeba
http://www.tweakxp.com/article37536.aspx
http://www.driverheaven.net/windows-xp-2k-radeon-di splay-drivers/1893-guide-uninstalling-ati-drivers-w inxp.html
http://forums.amd.com/game/messageview.cfm?catid=27 9&threadid=93154&enterthread=y