i have a serious probleme

[abdounapster]

hey guys
i have a HP notbook..n i tried to boot backtrack5 from a USB....it worked on making the USB bootable for backtrack...but when i try to boot from it....it start than it stops for no reason n sais like erreur or smthin like that
so if any one have any idea how to deal with plz help me
thank u so much