games?

im running win2k. on a p41.8 1gb ram, and geforce2gts. i have the newest drivers from nvidia, and can play games like max payne perfectly. but no such luck for cs / q3 / wolf. when i boot in, it just stops, and the screen goes blank.
i can get halflife to work, but not cs. when i boot into hl and try to set up a lan game, on my box, the ping is like 90. wtf?

if anyone can help, thanx