ShutdownGuard

ShutdownGuard tries to prevents applications to shutdown, reboot or log off your computer. When it prevents a shutdown in Windows XP, it will pop up in the tray and ask you if you want to continue. In Vista and Windows 7, you will see another dialog. ShutdownGuard won't notify you with the balloon tooltip when a shutdown is prevented. You must hold the shift button when attempting shutdown to make the balloon tooltip show again. Note that Silent does not work on Vista or Windows 7.