Thinking of selling my 17" MBP 2.33Ghz model and getting a smaller 15" new MBP instead. Now I have a legal, purchased copy (retail) of Windows Vista Home Premium. I had it installed on my MBP but went back to XP because of some issues but my question is can I install it on my new MBP if I get one without any problems or does the Microsoft hardware checker prevent me from doing so? Will Microsoft force me to buy a new license? I would hate the fact that my retail copy of vista would be useless because it was previously installed. What are my options? Thank you.