Well currently I'm running two full legit copies of Windows, XP Pro on my desktop and MCE on my wife's laptop. I'm looking at doing Home premium for both of them and wanted to know if I need to buy 2 "upgrade" copies? or can I get away with purchasing just one? be it the full or the upgrade versions? Is it worth the headache of moving to Vista in the first place? haha, like that hasn't been asked a million times.