[ubuntu-za] nvidia graphics

[miles sharpe]

Hi guys. I downloaded what I  think was the correct graphics driver for
nvidia riva tnt2
When I went to system preferences display it said run nvidia-xconfig
which I did. sudo nvidia-xconfig then it says restart your xserver.
I dont know how so restarted pc. now it says there is a graphics error
and wants to run in low definition mode.
I am lost.
Can you please help me