NVidia has produced an easier way of installing their video driver.
You pretty much run the script
  sh NVIDIA-Linux-x86-1.0-4496-pkg2.run
and then edit your config file (if you haven't already done that)
 /etc/X11/XF86Config-4

If you need to edit your config file, you can read the README.txt
that is in this directory, and you can get lot's of ideas of what
to put in.  But this is the basic stuff (from their readme)
  
-------------
If you already have an XF86Config file working with a different driver
(such as the 'nv' or 'vesa' driver), then all you need to do is find
the relevant Device section and replace the line:

        Driver "nv"
    (or Driver "vesa")

with

        Driver "nvidia"

In the Module section, make sure you have:

        Load   "glx"

You should also remove the following lines:

        Load  "dri"
        Load  "GLcore"

if they exist.  There are also numerous options that can be added to
the XF86Config file to fine-tune the NVIDIA XFree86 driver.  Please see
Appendix D for a complete list of these options.

-------------------


For the latest drivers, because these can get out of date, go to
http://www.nvidia.com/
and go to the drivers area.