[ubuntu] BOOT ERROR while trying to install Ubuntu 11.10 through USB

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http://ubuntuforums.org – Hey Every one... I had used ubuntu some months back and today i felt to get back to it. but i'm facing a problem now... I downloaded the version 11.10... and then as given in the ubuntu site, i used universal usb installer to make a bootable usb through it.. but when i tried to boot from it, it says BOOT ERROR... and takes me back to the STARTING WINDOWS screen.. pls help me out.. my laptop's conf's are... WINDOWS 7(x64) 4gb ram, i3 processor. (Hardware)