help!!!!

why doesnt opengl work on windows XP Pro? when i had windows ME all worked just fine, on XP when i starts a game like sof2,jediknight2,q3a i get the messege: Could not load Opengl subsystem.
CPU: P2 350mhz, 192ram, Ati 3d rage pro 2X
what should i do???

i think ATI releases openGL drivers(have you checked ati’s homepage?) but
most of Graphic Card Vendors dont.