The Shutdown Event Tracker is a feature within Windows Server 2003 and Windows Server 2008 that reports on events that impact the availability of the server. I prefer more centralized solutions (e.g., log forwarding and centralized logging) for such events, so I sometimes remove the Shutdown Event Tracker via a Group Policy Object (GPO). You can do this to an entire domain or to a collection of computer accounts. Read the entire tip at TechRepublic.
Disable Shutdown Event Tracker through Group Policy