Karn demonstrates how to make a fake and funny harmless virus that will shut down only your computer. First, go to your desktop and right click to access the right click menu. Then, choose new from the menu options and select the shortcut option. A window should open. In it type -s -t. The -t will represent the number of seconds you want the virus to activate. Also type -c. Create a message like, "This is a virus, your system is being shutdown." Name the shortcut anything that you'd like. The only way to stop the program is going to your start menu and selecting run and typing shutdown -a.