This is a long story so I'll try to trim it down, please ask for any information.
So, there I went to compile it. I booted into text mode, had the (.run) installer disable nouveau (which worked fine), rebooted (again in text mode), had the installer compile and set up the driver, and rebooted into text mode.
Suffice to say it was a mess of garbage, so I read the manual (again), looking for what it could be. It says something about AGP, so I disabled AGP with
NvAGP X server configuration option to 0, and while the garbage on the screen was less pronounced, it still looks like this:
Some things fail to re-paint, others paint where they should not, and it starts getting worse after opening applications until X crashes and restarts.
Edit: After looking around, I've seen quite a lot of threads with problems on this drivers, and this graphics cards, (and nVidia in general) on Linux, just no fix! I'm still looking for a fix.
Please, help me find the problem! It will be very very appreciated :)