open gl on a dual videocard system

im running a dual videocard and monitor setup on windows 2k, and everytime i start a game, like quake 3 that needs open gl, i cant get it to work. i try installing the latest drivers for my videocards, but as soon as i install it, it freezes on startup. im running win 2k on an amd 1.2 ghz athlon, 256 megs of ram, a msi ms 6341 motherboard, and an ati 3d rage pro agp, and a 3d rage II+ pci
any help would be appreciated