Shutdown Your PC within 3 sec Using Task Manager

There is even an other way to shut down your PC in 5 seconds. It has nothing to do with registry and is very simple as it uses the inbuilt task manager.

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  Open the Windows Task Manager by pressing CTRL+ALT+DELETE
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  Click on the "Shut Down" tab and the options will open up as shown in the screenshot above.
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  Now hold the CTRL key and click on "Turn Off".

Your computer will shutdown abruptly in just 5 seconds. This trick is fully harmless, provided you save all the open files and close down other applications.So you can use this, whenever you want to shut down your computer quickly.