You don't need to install the .run file from Nvidia. As I answered in your other thread. Use the xswat ppa
Open the terminal
sudo add-apt-repository ppa:ubuntu-x-swat/x-updates
sudo apt-get update
sudo apt-get install nvida-331 ppa-purge
ppa-purge is installed just in case something goes wrong you can use it to remove the ppa and downgrade the packages, but don't worry about it atm.
EDITED: HOLD IT!!!! I noticed that you are using 12.04.3 so you are using the raring graphic stack and there may be issues using the ppa. Better wait a bit before you do anything..
Saw this in the xorg-edgers ppa, not sure if it applies to x-swat as well
WARNING: Do not use this PPA with the precise X backport stacks, aka if you fresh install of 12.04.2 or newer. You can switch back to a compatible one by installing xserver-xorg-lts-precise instead if you do want to use these packages but horrible things will happen if you don't.