2.2.20-9? Don't you mean 2.4.20-9?
2.2.20 is amazingly old... I don't think you're running RH 6, after all.
Anyway, your question is answered in the README:
Q: I've installed the driver, but my Enable 3D Acceleration checkbox is still
greyed out! What did I do wrong?
A: Most distribution-provided configuration applets aren't aware of the NVIDIA
accelerated driver, and consequently won't update themselves when you install
the driver. Your driver, if it has been installed properly, should function
(side note: I've always wanted to point people to the README when asking that question -- thanks nVidia for putting it in there!
For the other question, what do you mean by "choose tv-out"?