Open up Software Sources and in the last tab you will find Additional Drivers, there you can mark that you want to use the nvidia-current drivers. Turning on proprietary drivers this way, ensures your system will make sure you have the latest available drivers (As in, the latest nvidia-current) as well as making sure it is preserved between kernel updates.
You may also do this by issuing the following
OR by clicking here
sudo apt-get install nvidia-current
Make sure you have also installed linux-headers-generic!!! If you don't the driver might fail to install. There has been a bug once 12.10 was released that prevented it from being automatically installed (Older Ubuntu versions are not affected). Not sure if it was fixed.