Hi and welcome, You say that there is not a driver located under system, administration, hardware drivers?
Originally Posted by iZephyr
If not then you can use synaptic manager and search for nvidia-glx-new.
You may also use Envy.
And last you may use the terminal located under applications, accessories. Use this command
You can also use the xfix option if you boot into recovery mode which is usually the second choice from the grub.
sudo apt-get install nvidia-glx-new
Edit I almost forgot you will need the nvidia-settings also to help set up the dual monitors with the command