[ubuntu] Problems after installing graphic card drivers

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http://ubuntuforums.org – Hello there I installed 12.10 a few days ago and everything has been fine until I downloaded the Nvidia drivers from the software centre. Now, whenever I boot into Ubuntu, I've lost the side bar and the top menu bar and the screen resolution is much lower than it was (everything looks much bigger on the screen). Thinking I had probably corrupted the graphic card drivers, I reinstalled Ubuntu (selecting option 1 - not to overwrite the settings) but unfortunately, this hasn't made any difference. My graphics card is a Nvidia GeForce 6150se nforce 430. I'm guessing I need to enter something vi (Hardware)