Problem with nvidia drivers instalation

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http://askubuntu.com – I want to install new nvidia drivers R310 so I downloaded driver and when I run it it says that i can't install new drivers because there is this nouveau driver. It asked me if I want to add blacklist file with nouveau in modprobe so I said yes please. After reboot same thing, I searched through endless topics/questions/etc, i ran sudo apt-get remove --purge xserver-xorg-video-nouveau and tried other things and still didn't find solution how to install new drivers. (HowTos)