when you say update, did you just install them over the previous ones?
You need to run a driver cleaning program before you update Video Card Drivers.
Driver Cleaner 3 Pro, is probably the best program for that imo.
Also Chipset Drivers, I believe you can install over the previous ones.
What are your specs?
What video card?
Aren't Doom3 and Halo2 opengl games?
Sorry should have posted specs. ATI 9800 pro. 2800+ amd. wxpsp2. directx9.0c latest ATI drivers from their website. in pacific assult the guys heads shoot all the way across the screen.. hard to explain. has happened b4 but a bios update fixed the problem.