[lubuntu] nvidia problems

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http://ubuntuforums.org – While changing my monitor setup I somehow managed to disable my nvidia video drivers. Now whenever I boot the computer it flashes the Ubuntu loading screen and then goes plank or distorts the screen and hangs. I have tried removing the drivers from the terminal and reinstalling them to no avail. I can't remeber what kind of nvidia card I have but I was previously using the experimental beta drivers. What else can I do? (Hardware)