Half-Life says OpenGL not supported by Voodoo3 3000 PCI

I have a problem (gee, that wasn’t obvious), this problem is that I have changed the video options in Half-Life so it uses OpenGL. Unfotunately, when I try to play the game it says something like “The selected OpenGL is not supported by your card.” Can anyone tell me why it says that even though I have a Voodoo3 3000 PCI?

I had a voodoo3 2000 pci and to make Halflife work in openGL I selected the 3dfx mini driver, It should be in your list of choices within the video configuation/opengl for Halflife.

try it,

That is what Iwas trying to do in the begining and it gave me that error. So, I did a very long search on google.com to find an answer and I came across some page that a guy posted a reply or something about what he did and I followed his directions. Now it works perfectly, but only it I use default OpenGL.