SONY's license lets you install it on more than one computer that you own as long as you don't use it on more than one simultaneously. I don't know how many reinstalls you can do before your license key stops working, but it's a pretty fair amount. Probably no one outside of SONY should know what that number is. I know i've reinstalled the same license key quite a few times on my computer without any trouble. I've only had one so far get to the point of telling me i had too many activations and that was after having terrible hard drive difficulties on my livingroom MP3 player computer and reinstalling probably well over a dozen times.