Open GL

Hy eweryone.
I have an NVIDIA RIVA TNT 64 PRO video card and the Return to Castle Wolfenstein did not work, because the next message pop’s up:
Could not load OpenGL Subsystem. My OS is WinXP and I dont know what shuold I do to work this game. Please help me!!!

Have you downloaded and installed the drivers from Nvidia or are you using the ones which come with XP?