Andrew: your problem is easy to solve. Type:
sudo apt-get remove --purge nvidia-173-kernel-source nvidia-settings
and restart the Xserver.
Ahmed: your problem must be different since you're using an NVIDIA card.
Can I see your /var/log/Xorg.0.log and the output of "glxinfo"?
** Changed in: compiz (Ubuntu)
Status: New => Invalid
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Compiz segmentation faults after Intrepid update
https://bugs.launchpad.net/bugs/267217
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