Microsoft has just given a demonstration of Windows 8 with new user interface (UI) designed around a tile system like that of Windows Phone 7.Are you want windows 8 start screen appear in your Windows 7 OS ?
Windows 8 replaces start screen with a tile-based screen which replaces the Windows Start menu with a customizable, scalable full-screen view of apps,Live tiles with notifications, showing always up-to-date information from your apps.
Follow below step change your Windows 7 start screen as Windows 8
1.Go to Rainmeter.net downloading rainmeter software.
3.Now install Rainmeter software.Then unzipped Omnimo 3.1 for Rainmeter,double click the Omnimo.rmskin file, the extraction might take a minute or two, after that you’ll be guided by the intro.That all.
Below is preview of Windows 8 start screen of my PC.
Here is the Windows 8 official video.
PS : Please backup your windows 7 system first before execute the software.