Unknown display

Hello fellow homans.

I'm trying to get a gist of Linux. I've tried arch/manjaro and recently installed Ubuntu.
Anyway, my video card driver seems to be messed up and I'm not able to adjust monitor resolution / connect to TV with extra HDMI.

Could anyone please provide a guide how to reinstall / reset nvidia drivers?
I've googled and tried some xrandr commands, to no prevail.
I downloaded a driver from nvidia.com - but I'm not sure how run the installer on this OS.

I really dont want to reinstall. Any help is much appreciated!

Geforce 1070.