You can reinstail them, that was a myth someone spread around. I have installed it six times since January.
I heard that the oem version of windows xp pro is a one time installation. So if i install windows xp pro with an oem disk, i can't reinstall it. But if i buy a retail version, i can install and reinstall as many times as i want to. Is that ture? and is there anything else i should know about the difference for the oem and retail version of windows xp pro?