If that is too difficult for you just boot normally to a gui, Ctrl+Alt+F1 to get to a tty command line, then login and use commands
Code:
sudo service lightdm stop
and then navigate to the folder where your NVIDIA.run is sitting and use the command you did before to execute it.
Now you should be able to start the new xsession with
Code:
sudo service lightdm start
or maybe just
Code:
startx
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