go to text console by pressing CTRL-ALT-F1;
log in as root
shut down display manager like this:
then install nvidia
edit the config file
if you still have the same problem
you should look into /var/log/messages and see what it says.
else you can startx -- -logverbose 5 and see what it says...
try ldconfig as root
Alien is my name and headbiting is my game.