Q: how do you download movies to pc

You have iTunes installed on your computer ? If not then you can download it from here : http://www.apple.com/itunes/download/

You can buy films from the iTunes store on that - find the film that you want to buy and click on its price. They will download onto that computer's drive and go into the Movies part of your iTunes library. You might also be able to redownload past film purchases (depending upon your country and if they are still in your country's store) via the Purchased link under Quicklinks on the right-hand side of the iTunes store home page on your computer's iTunes