Gizmodo has a write-up on how to turn an XP Home system into Pro by just tweaking the registry.
It’s a horrible (not to mention unethical) idea. You can’t install SP2 on this system, so you massively increase your chances of getting infected.
Apart from intellectual curiousity, one should stay far, far away from this whole idea.
Link here (via LifeHacker).
Alex Eckelberry