Nvidia Drivers requires you to exist the X-Windows environment completely before you can install the drivers properly. Instead of booting into console mode, you can do the following:
Step 1: Down the Nvidia drivers from http://www.nvidia.com/Download/index.aspx?lang=en-us
Step 2: CTRL+ALT+F1 to take you into a non-X terminal
Step 3: Stop /etc/init.d/gdm (GNOME)
# /etc/init.d/gdm stop
Step 4: Install Nvidia Drivers
# ./NVIDIA-Linux-x86-185.18.36-pkg1.run
(Install Nvidia drivers that match your graphics card and follow the installation wizard)
Step 5: Start /etc/init.d/gdm
# /etc/init.d/gdm start
