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.