To shut down Windows 8 you need to use the Power option under Settings from the right hand Windows 8 charm.
Use the following steps to shut down windows 8
1 – Open the right hand Windows 8 charm by moving your mouse to either the top right or bottom right corner of your screen/monitor.
2 - Click on Settings option within the Windows 8 Charm
3 - Click on Power.
4 - Click on Shut down.
There's an easier way to shut down windows 8 by using the keyboard. If you hold down the Windows key and then press i - this will take you straight to the settings option within the Windows 8 Charms. All you have to do then is click on Power and then Shut down.
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