Saw here on the message board the follow posting:

Those of you out there who are experiencing crashes in Opengl games such as Soldier of Fortune (e.g. GLimp_EndFrame() - SwapBuffers() failed!) after installing the Detonator 2 drivers for Windows 2000 will need to fix it using this procedure.
1. Click, Start, Run.
2. Type in regedit & hit Enter.
3. Go to [HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsNTCurrentVersionOpenGLDrivers]. Delete the RIVATNT subkey.
4. Go to [HKEY_LOCAL_MACHINESoftwareMicrosoftWindows NTCurrentVersionOpenGLDrivers] & make a New String Value entitled RIVATNT & give it a value of nvoglnt.
Thanks to the nVidia newsgroup (unknown_error in particular) for mentioning the basic fix.

hope it helps ...