could not load opengl subsystem

ok, I played quake 3 and mohaa in my pc before with win98… i upgraded it to xp and i cam only play quake!! when i try to load mohaa this message appears: could not load opengl subsystem… help me!!!please!!!

The drivers that come with XP dont support OpenGL.

You have to go to the website of the manufacturer of your 3d card, and download/install the latest drivers for your card.

i tried to download the nvidia drivers cuase i am having the same problem…i instllaed them…restarted and it still didnt work and my OpenGL test system said something was SCREWED UP!!! HELP!!!