liveusb(created with liveusb-creator) not boot

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http://forums.fedoraforum.org – hi everyone i've download the .iso file and then create liveusb with "liveusb-creator" but in time of installation it does not booted -BIOS setting is fixed for removable first boot -i have windows 7 and ubuntu 12.4 in my computer (computer booted with grub) any idea?:confused: (HowTos)