How to Customize the Windows 8 Start Screen
Remove tiles you don’t need.
Spot a tile you don’t need? Right-click it and choose Unpin from Start. Repeat until you’ve removed all the tiles you don’t use.
Choosing Unpin from Start doesn’t uninstall the app or program; removing the tile merely removes that item’s start button from the screen. In fact, if you accidentally remove the tile for a favorite app or program, you can easily put it back in Step 3.