That's because the Metro Style look of the start screen, but the truth is this windows can be used on lap top and desktop PC also. The Start Screen has tiles that represent: apps, people, websites .... all information you wanna know up to date. There is a lot of apps you can use here ... apps for games, apps for people (their social updates on your screen) and a lot of other "apps" for information. There is new Internet Explorer, Media center that looks realy cool. The minimum specifications you must have to run this Windows are:
- Processor: 1 gigahertz (GHz) or faster
- RAM: 1 gigabyte (GB)
- Hard disk space: 16 GB (32-bit)
- Graphics card: DirectX 9 graphics device or higher
This spec are official from Microsoft and if you wanna use all the features you need to have a tablet or monitor that support touch, internet connection for Windows Store and download apps ...
The official date is still unknown when the Windows 8 will come ...
For more information on the official site