Another poster had helped me get off the ground, but now I am in the same situation you are.
If I try to boot right into X i get the same message. However, if I boot failsafe and manually modprobe (error here) and then startx I get X with OpenGL-- and can play tuxracer!
What does 'modprobe' do? and does it stick??
Intel D845EBG2L P4 2.4