I see you mention LinuxLive but for years I've run Ubuntu and others off USB without such. This means I can't help you as you have used something I have not used and have no use for.
So why not go with the usual and keep in mind that old machines do not boot from USB and unless the maker adds that then it's the end of the line.
ok. a long time ago, my dad's computer broke, lots of weird things happened and it's only about a fifth as fast as before, tops. it runs windows XP professional. i pestered my dad about getting somebody to fix it, but i never got around to it. so one day, while my friend was fooling around with some of his USBs, installing linux onto them, and i thought, maybe i could run linux off my dad's computer, install it over windows, and run virtualbox off it with a windows xp/7/some other kind of ISO (never windows 8!) so it would be back to normal. kind of. so anyway, i set up ubuntu onto a USB on a different computer, using linuxlive, and then tested it on the same computer, and it worked, but when i tried to launch it from the BIOS menu, it came up with heaps of options that i didn't understand. could anybody help me out? i could provide some screenshots if you need.