[ubuntu] Screen rotation did work now does not

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http://ubuntuforums.org – I just installed Ubuntu 10.10 back on my desktop. It looked good, and then I had to update all the files, which took an hour or so. The reason for using 10.10 is another story posted elsewhere on this forum. Prior to updating my resolution was excellent and I could click on System > Preferences > Monitors and I could rotate monitor image right or left or invert. After the updates I could not get the same resolution nor could I rotate the screen. I now had to use the nvidia drivers which obviously does not allow for screen rotation. How can I get back to the initial set up where (Hardware)