Radeon 7200 VIVO and Q3 problems

hi, is there anybody that can help me please ? If I try to run any Q3 enginebased game on my Athlon 1200 with Radeon 7200 VIVO (Win 98SE) all Ive got its a neverending loading and finally a sistem lockup. Please consider that I have new drivers, DX8.1, VIA GART, etc. I`ll try to read the message in the console for you. Thanks !