Working Linux Bootable USB won't work on my computer
 

I installed the new Ubuntu 10.04 on my 8 Gigabyte Pen Drive and it works, I've tested it on a friend's computer. But whereas in his works, in mine it doesn't. My computer is able to boot from USB (or so it says), it has 5 options to choose from: ZIP, USB-ZIP,USB-CDROM, USB-HDD, USB-FDD. None of...