Photoshop’s an awesome program, but it’s not worth a darn until you install it. Whether you’re holding an actual Photoshop DVD in your hand or you’ve downloaded the program from the Web, the Photoshop CS4 installer includes everything you need to get up and running fast. If you’ve got a relatively new computer, the whole process can take as little as ten minutes. If you have a vintage computer, it’ll take a bit longer.