You probably have to install the driver under safe mode since the nvidia driver needs a reboot to completely uninstall. In safe mode you can install the thing. I don't know what the catch was anymore but I had some trouble with new drivers under windows (they're runnning fine on linux) as well and it took me a long time to get back up. So you should backup anything and maybe prepare for a complete new install if it doesn't work quick and you don't have the time to play around.
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