Hey guys trying to fix a friends computer and he got a virus that messed up his MBR. I was trying to boot the windows XP disk into recovery however it throws errors before I could reach the prompt to hit R to repair the system. I was going to try to boot a startup disk however he doesn't have a floppy drive and I was trying to figure out how to boot from a flash drive but that was hard to follow.. any advice or tips how to fix/clean his MBR? Thanks!