#Nvidia Driver install 
1)ctrl+alt+f1 ,login as user 
2)stop X  with sudo service kdm (or gdm) stop
3)sudo aptitude remove "installed-nvidia-driver" 
4)sudo aptitude install nvidia-current 
5)follow the instructions for your driver install including any required dependency options 
6)start X with sudo service kdm (or gdm) start 
7)create xorg  sudo nvidia-xconfig