drivers anyone?

does anyone know where i can find alternative drivers for riva TNT2 diamond viper 770 video card. detonators reduce my screen to a red blip in the top left corner and drivers on and the official riva site do not work
i get a hard freeze starting quake3 and kingpin, both of which require openGL 3D rendering
both games were working fine b4 i installed new mb (soltek) and processor P3 933