It ain't gonna happen...

I recently bought a game which I installed. So far so good. Then I tried to run it, and a message came up with

WARNING: missing Glide installation, assuming no 3Dfx available
…shutting down QGL
----- CL_Shutdown -----

GLW_StartOpenGL() - could not load OpenGL subsystem

So what does this mean exactly? I’ve read through what is apparently relevent on this site, but I’m still unclear on a few points. Is there anything I can do to remedy this? Is there some vital component missing from my computer? I’m using WinME, and was fairly sure I had all the requirements.