There is a "crack" for all versions of XP. I know about it because I work in a computer shop as a paid hobby. When I say all versions, I mean XP pro, XP home, XP oem, XP corp (there are many available for this one).
However, if it is a legitimate version, I would'nt crack it. I might be mistaken, but you can install XP one one home system and one laptop, if the condition of neither system being on at the same time.
The best thing would be to call MS support number given when you are trying to activate the os. They don't ask any "personal" questions and usually are friendly.