I just swapped out the motherboard and cpu from my youngest son's system upgrading him form an Intel PIII 866 to a Shuttle AN35N N-Force 400 Ultra with XP-1700 T-Bred. I did a clean install of XP Home after reformatting the C drive. XP installed its' own driver for the MSI Geforce 4 Ti-4200 video card, and everything seemed to be okay, until we tried to play Call of Duty, and it gave us the "no Open GL" and could not run. We have tried repeatedly to remove the driver for the vid card and install different ones, both new from Nvidia's website, as well as older "tried and true" drivers like the 45.23 detonators. It seems like XP auto loads its' own driver and overwrites whatever we try to install. The frustration is that the old INtel 815 chipset board with Win2K ran it just fine, while the new improved faster system with more up to date OS can't even run it. Any ideas or suggestions? I can't keep staying up until 2:00 a.m. trying to get it to work :| Thanks for any suggestions.