1) You should try the newest driver available here: kano.mipooh.net

install-nvidia-5336-debian.sh

2) You should be able to run it from a virtual terminal.

3) I had to use the 4496 driver as the 5336 failed to work correctly. (killed X) until I tried the 5328 verison which works great with XFree86 4.3.0-2 on my nforce1 mobo.