I've had RMXP for ages, and I've been able to reinstall it without much of a problem before... but I recently formatted my PC and am attempting to re-install it, but it tells me my Serial Number has already been registered. This wouldn't normally be a problem, and I could just use the activation code... except that I've upgrade my computer a lot, and if I remember correctly, the Activation Code is generated based on your computer's hardware.
Basically, now I can't re-register RMXP, and am stuck with a Trial version... I really can't afford to spend another $60 on it again, is there anything I can do?