Just put the file in your home directory "spock".
Then use the Tab button once you have got to NVIDIA to autocomplete (the terminal will finish the rest for you). It avoids typing errors:
Hit Tab and you should get:
chmod +x /home/spock/NVIDIA
Then hit Ctrl+Alt+F1 to leave the graphical desktop.
chmod +x /home/spock/NVIDIA-Linux-x86-195.36.15.pkg1.run
Kill GDM with either:
Now install the Nvidia binary with:
sudo /etc/init.d/gdm stop
Once it's installed, load the module with:
sudo sh NVIDIA-Linux-x86-195.36.15.pkg1.run
And start the desktop with:
sudo modprobe nvidia
You may need to configure X if there is a problem, Nvidia is like that sometimes.