OpenGL Problem

I use sissoft sandra to check what version of opengl I have. And it says I have the Microsoft version 1.1. Then when I install the Nvidia Detonator for windows xp, I check it again and then it has Nvidia version 1.3. But after I try playing counter strike, opengl doesn’t work. So then I go back to check with sandra and it says that I have Microsoft opengl version 1.1 installed? Does anyone know why the Microsoft version always overwrites the Nvidia opengl version? Please let me know if anyone knows how to get ride of it.