I found that the Nvidia .run file from www.nvidia.com would not install, complaining it couldn't find certain modules and xorg modules then use this bash script to execute the .run file:
#!/bin/bash
sudo sh "${1}" --x-prefix=/usr/lib/xorg --x-module-path=/usr/lib/xorg/modules
There is also information found at this link
http://doc.gwos.org/index.php/Latest_Nvidia_Dapper
I have not tried this method and it differes from my above suggestion [that works for me].