I have a problem with the Driver & update window. I can't install the proprietary nVidia drivers.
I select the top driver (a nVidia one) and hit apply. But it goes back to the 3rd option - Nouveau.
Try with a terminal.
Open terminal, and run the following commands:
sudo add-apt-repository ppa:xorg-edgers/ppa sudo apt-get update
Then install the driver:
sudo apt-get install nvidia-337
337 to any version you want - I'd recommend
349. I'm using