1- open desktop and right click.
2- Select "new" => "shortcut".
3- type "shutdown -s -t 'time in seconds' -c".
4- rename the shortcut and finish.
5- see the shortcut on the desktop.
6- right click on the shortcut and select properties.
7- here u see a button "change icon" click on it.
8- select a icon of ur choice.
9- ur shutdown virus is ready ^_^ enjoy.