I have a diamond mm viper 770 video card agp2x and i want to run Grand Prix 3 with 800x600. The Test of GP3 said i should use 640x480 but that is not what i want with a viper770 32mb video card. It runs in 800x6700 mode ok but just sometimes the picture freezes (very very short), what can i do about this? I use win98 se and original viper770 video drivers.