[SOLVED] help! error configuring xorg.conf for 8600gts in hardy

[conphuzed]

i followed this guide trying to install nvidia drivers correctly. upon booting back into the desktop and trying to configure nvidia settings, here are the results:

sudo nvidia-settings

result:

"You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server."

so i tried:
sudo nvidia-xconfig

result:

Using X configuration file: "/etc/X11/xorg.conf".

VALIDATION ERROR: Data incomplete in file /etc/X11/xorg.conf.
                  Device section "Configured Video Device" must have a Driver
                  line.

Backed up file '/etc/X11/xorg.conf' as '/etc/X11/xorg.conf.backup'
New X configuration file written to '/etc/X11/xorg.conf'

what to do?