So I'm in the process of moving to a new PC and I'd like to move my current hard drive over intact so I don't have to reinstall all my stuff onto a new PC. As my current install is on an OEM copy of Windows XP Pro, I know that it is considered illegal to use it on a different system (i.e.: different mobo) and I'd like to know how to change the current key to the new key without reinstalling Windows. Also, do I need to deactivate the old copy first before changing the key?