Display error when installing ubuntu

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http://askubuntu.com – when installing ubuntu 12.04 from a usb-stick, as soon as installer runs, an error message appears and i can only see the upper half of the screen. for the way the pointer dissappears at the bottom appearing directly at the top of the display, it looks as if both halves of the screen were overlapsed in the upper half. any ides of how to solve this? i tried to change de resolution at the display options with the little i could see, but this wouldnt work (HowTos)