Never Shutdown Your Computer Without Your Permission

Here is an useful tool called ShutdownGuard. It prevents Windows to shutdown, reboot or log off.
When it prevents a shutdown it will pop up in the tray and ask you if you want to continue.

Some quick features :
1) Compatible with Vista.
2) eordered shutdown dialog buttons.
3) Middle click on tray brings up the shutdown dialog.

Download Instructions : Click here to download