Method 1 : Shut Down Using Start PanelStep 1: Mouse over Start Button and Click on Settings to bring up Metro Settings Menu. If you are using Windows 8 in Metro UI Mode – take your mouse to bottom left hand corner to reveal Start Panel.
OrPress Win + I to bring up the Metro Settings Menu.
Step 2: Look for Power Button in bottom right hand corner. Click on it and select the appropriate Power Option.
Method 2: Shut Down Using Classic Ctrl + Alt + Del CombinationIf you are too lazy to use the first method to shut down your windows 8 computer then you can use the Ctrl+Alt+Del combination to bring up option menu.
Click on Shut Down Icon at the bottom right hand corner of screen and select the appropriate options. The best part about this method is that it will work regardless of whether you are using Windows 8 in Metro UI Mode or Desktop Mode.