I too uses NVIDIA grfx card and Ubuntu is the easiest distro for me to enable nvidia graphics support.Debian too have repositories for drivers(unofficial)
My humble suggestion is dont go for nvidia's installer in debian based systems like ubuntu,mepis etc.
.there is no need for going to nvidia site or for that matter any other site for getting packages as with windows,that is the beauty of debian apt package manager.check menu System>admin>synaptic for ur packages first.
Now for me i just apt-get install restricted-manager .in restricted manager tick the nvidia thing.i then apt-get intall nvidia-glx,nvidia-settingsedited /etc/X11/xorg.conf device section for specific effects available from nvidia card that's all.run nvidia-settings for options.
Code:
/etc/X11/xorg.conf
Section "Device"
Identifier "nVidia Corporation G70 [GeForce 7300 GT]"
Driver "nvidia"
BusID "PCI:1:0:0"
Option "XAANoOffscreenPixmaps" "true"
Option "AllowGLXWithComposite" "true"
Option "AllowDDCCI" "True"
Option "NoLogo" "True"
Option "RenderAccel" "True"
Option "TripleBuffer" "true"
EndSection
the ubuntuguide site explains the things very nicely.
*ubuntuguide.org/wiki/Ubuntu:Feisty#How_to_setup_nvidia_drivers_in_7.04
and then there is Envy script.
*ubuntuguide.org/wiki/Ubuntu:Feisty#How_to_install_Beta_Graphics_Driver_.28NVIDIA.29