Do you use windows 7? But you want a start screen? Okay, lets use Iobit WinMetro
What does WinMetro do?
WinMetro is specially designed to bring the newly introduced Windows 8 Metro UI to Windows 7, Windows Vista and Windows XP. It offers an easy solution for old versions of Windows users to try and enjoy the tile based Metro UI. By displaying useful information such as weather, calendar, news, stocks, and frequently used programs, it turns your desktop into an informative and productive work station. It also offers the option to boot to Metro Start Screen directly