Log out of X, but do not restart the computer. Push ctrl-alt-F1. Login as root.
Change to runlevel 3 (text mode only) with the command: telinit 3
Install the driver. Edit the config file if you didn't already (you might want to do this in X before logging out). Make sure you've replaced 'nv' with 'nvidia' as the driver for the video card.
Change to runlevel 5 with the command: telinit 5
You should see the nvidia logo appear. If it fails you'll need to edit your config file back to 'nv' in order to start X until you find the reason it failed.
"..the triumph of evil is for good men to do nothing."
VIDIA video driver RPMs for Fedora
:: see yum repo at livna.org