Duff-Man says....first of all....you ought to try searching the forum before creating a new thread for a question that gets asked almost daily.
To answer yet again, the discs that come with a computer are for *that model only* and will not work on other models. Also, *you are not licensed* to install on other computers....having a disc does NOT entitle you to install on any computer you wish.
You need to buy another disc - if you want to upgrade multiple computers just buy the "family pack" disc....oh yeah!