The only way you could really do it, is to format the hard drive first. Microsoft has an aversion to people downgrading. If you can log into his account though, why not simply create a new user with administrative privilages? I don't really understand why you can't remove files and data if you are logged in. What exactly does the computer say when you try? Failing that obtain a copy of windows xp pro from the internet, you can gaurantee it's available somewhere, (although I wont provide links as I would be thrown off after just an hour of being registered here.) LOL Then use magicjellybean to find the genuine key from the currently installed system. http://www.magicaljellybean.com/keyfinder/
