Close down all programs, click on the Start button, and select Shut Down.
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To shut down, you should first close any programs you have been using. Then, click on the start button in the lower left-hand corner of the screen. This should bring up a menu with several options, including one at the bottom marked Shut Down. Depending on your settings and the version of Windows that your running, . Click on Shut Down and wait for a confirmation box to appear.
The box should give you a drop-down menu with several options, including Shut Down, Restart, and Stand By. Select Shut Down or Turn Off and click OK. The computer will then go through the process of shutting itself down; this may take several minutes, so be patient.