Nascar Racing 4 & ATI Radeon 64mb ddr

While playing Nascar Racing 4 w/Open GL at any screen resolution screen freezes or system reboots. Loaded current drivers but makes no difference. P3 850mhz, 384mb RAM, Radeon 64mb DDR memory…any thoughts

If the game freezes is it often because the BIOS setting for AGP is too high. Try to change them.