i bought a 200 dollar emachine computer a while back that came with vista home basic on it and thats the OS i have been using since even though the only thing that remains from the emachines PC is the HDD. i recently bought a western digital 250gb 7200 sata drive and wanted to transfer vista and everything else to the new drive so that i can just use the emachines HDD for music and movies storage, because im guessing the WD drive would be blazing fast compared to the emachines. since my hardware has changed, every time i reformat i have to call microsoft and verify a series of numbers so that they know my copy is legit, and then they activate it for me by reading out a dozen boxes of numbers. someone told me that if i switch the OS to the new hard drive, that microsoft wont be able to validate it anymore, and i would then have to buy an entirely new OS. which needless to say, i dont wanna do. is there any way i can do this?