[ubuntu] desktop stretched outside of the corners

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http://ubuntuforums.org – Hi Yesterday I installed Ubuntu 9.10. I have Nvidia GForce7050/nforce 610i video card so I installed the Nvidia Version 173 driver from the repos. Then I set the resolution of 1024x768 but the problem is that the desktop area is stretched outside the edges of my monitor (Dell LCD) and I can access the four corners of my desktop my moving the mouse to the edge. Can anyone tell me that how can I fix that problem? Thanks (Hardware)