Can You Take A Previously Register Copy Of Quickbooks And Install It Onto Another Computer?

and not register it? At work we are using Premier 2006 and are upgrading to Premier 2009 so that will leave 2 copies of 2006 to just sit around and collect dust. I was wondering if I could install it on another computer without registering it as I don’t need to have any sort of customer support, etc. just need it to do simple invoices as a contractor?
Thanks!