[ubuntu] What happens after installing nvidia graphic drivers?

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http://ubuntuforums.org – Hey guys, I'm going through some sort of most weirdest problem here. During and after installing Ubuntu 12.04.1 x64 LTS. My NVIDIA - 9600GT Graphic card's Cooling fan rotates on the most high RPM and that is obvious to install Graphic Card's drivers to slow it down. When I install graphic card's drivers, I am not able to boot into Ubuntu again. After boot screen comes, theres no progress after it. I try to go into recovery mode and repair packages, but all in vain. I changed my source, tried to install from "ubuntu-x-swat/x-updates" ppa, but also it does the same. Please advise (Hardware)