Ubuntu Mint Install Nividia GTX 480 Drivers

First I went to the Nividia website:

http://www.nvidia.com/object/linux-display-amd64-285.05.09-driver.html

And found the right driver for my system. Downloaded the ./NVIDIA-Linux-x86_64-285.05.09.run file.
Change the permissions so I could execute:

chmod 777 ./NVIDIA-Linux-x86_64-285.05.09.run
Then I executed it:
./NVIDIA-Linux-x86_64-285.05.09.run

But it gives me a warning and says I have to kill my xserver. I Do this (I am using gnome):
sudo /etc/init.d/gdm stop

After I kill it I run the same command I tried above and follow the directions and it worked fine.