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how do i boot the linux iso from a usb flash drive when the the original os doesn't work?

i have an old IBM 390X that i have installed windows xp, but that has glitched and i want to install linux from a usb thumb drive, i have never done it before so i want to try it; i know how to install os's from cds and floppys.
two more questions
1-can linux run exe's?
2-how do you edit the code in linux? because i heard that it was oped scource

red_green5 years ago
you could look up how to edit the bios (different on most computers), do that, and when you are in bios editor, got to boot menu and put your flash drive at the top of the list