In this Aug. 24, 1995, file photo, Microsoft Chairman Bill Gates sits on stage during a video portion of the Windows 95 Launch Event on the company's campus in Redmond, Wash. One of the biggest changes with Windows 8 is the disappearance of the familiar start button at the lower left corner of the screen. There will be a new screen filled with a colorful array of tiles, each leading to a different application, task or collection of files. (AP Photo/File)