Alright guys, I upgraded to 8.04 from 7.10 a few days ago and everything was working fine up until this morning. The highest resolution I can set my monitor to is 640x480. After reading around various forums, I've tried 'sudo dpkg-reconfigure -phigh xserver-xorg' and then 'sudo reboot', which didn't fix the problem. I also tried disabling my Nvidia drivers through Admin>Hardware Drivers and then re-enabling them hoping maybe the drivers would update, but no, that didn't work either.