Ok to install the Nvidia drivers just do a su from a terminal cd then go to /sbin and execute the init script. That is do a ./init 1, this will basically get you into single user mode, your X server will get shutdown along with a bunch of other stuff. Once you've done this you'll get an sh# prompt, once there just go to the directory inwhich you downloaded the nvidia drivers and execute the program once again doing ./name of driver version. Once you do this everything should be very self explained since the installer has a gui that guides you through the process. Remember to edit your X11config file so that it loads the nvidia driver instead of the nv driver. Once you've done this just switch back to run level 5 do this by typing init 5, and you 're done. Probably there is an easier way but this is how I've done it lots of time. Anyway hope this helps
.BTW you'll now that the drivers installed sucesfully if you see the Nvidia logo when X is booting up.
I think I did this once and it did gave me some sort of error about X server has to be shutdown for the insallation. Again I could be wrong, in fact that happens very often 
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