I believe that you have to download the driver from :
http://www.nvidia.com/object/unix.html
to install:
set the runlevel of your system to 3
# Edit the file /etc/inittab
# In the file is a line like: id:5:initdefault: change this to 3
reboot
make a copy of your Xconfig files (/etc/X11/xorg.conf and /etc/X11/Xconfig)
Install the driver using:
sh ./NVIDIA.XXXXX.sh (where XXX is the driver build no)
you will have to have gcc and kernel headers installed to allow the driver to compile correctly (I have never found a "Precompiled Kernel" on the Nvidia FTP site
allow the installer to configure your Xconfig files (backups of your originals will be created at this point)
type startx to see if everything loads correctly, once you are happy (reboot just to be safe) change your runlevel back to 5
Jay