 One major difference between Vista and earlier versions of Windows, Windows 95 and later, is that the original start button was replaced with the Windows icon in a circle (called the Start Orb).Vista also features new graphics features, the Windows Aero GUI, new applications (such as Windows Calendar, Windows DVD Maker and some new games including Chess, Mahjong, and Purble Place), Internet Explorer 7, Windows Media Player 11, and a large number of underlying architectural changes.Windows Vista has the version number NT 6.0.