First download the NVIDIA drivers from
http://www.nvidia.com/object/unix.html
then go into yast and get the kernal source is installed (make sure its your kernal). also make sure gcc glibc are installed
then go to a virtual terminal (Ctrl-Alt-F1) and login as root
then type
init 3
To take you to run level 3 (no xserver)
then
chmod +X path/to/Nvidia/driver
to make executable
then
./path/to/Nvidia/driver
this will take you though a compile and install wizard wich finishes by wrighting a x.org file using the driver. it may need some tweaking.
hope you get it working