Boot error when using a USB

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http://askubuntu.com – Hi I'm trying to install Ubuntu 12.04 using a usb stick ,i'm currently using ubuntu 10.04. I have a 12.04 LTS.iso and tried to make a bootable stick using start up disk creator is fishes the process and when I try to boot I get a "boot error" msg displayed ,I dont know how to use UNeT bootin. my md5check sum is ok... please help I have a c2d 2.66,2gbram 320gb hdd (HowTos)