You could try it. What you do is install XP on one of the computers, activate it, then wait a week, and install on the second one. When it makes you call MS for a new key, just tell them that you overclocked your last computer to hell and back, fried the mobo and cpu, and corrupted your hard drive. You just bought a new computer, and are re-installing XP on that one.
If my baby don't love me, I know, I know, her sister will.