Shutdown timer

You can create your own shutdown timer on your desktop.
Right-click your desktop and create a new shortcut.
Paste the following code into the Location box :
shutdown -s -t 30 -c “Type your text here“

Replace 30 with the length of the countdown you want (in seconds).
Click next and rename the shortcut.
Next you’d want to change the icon.
Right-click on the shortcut you made and click properties.
Find the Change Icon button and choose a suitable icon.
To disable it, click Start->Run and type "Shutdown -a"