Harry Potter Screensaver and Wallpaper. Harry Potter and the Sorcerer`s Stone by J. K. Rowling. The amazing popularity of Harry Potter and the Sorcerer`s Stone means that now even Muggles know about the Leaky Cauldron, Diagon Alley, and Hogwarts School of Witchcraft and Wizardry. Whether or not you`ve read about Harry, this screen saver brings his world to life. This screensaver brings brillant of pictures of all the characters.