如果VISTA關機的時間很長..就可以落這個PATCH~~~

This update to the .NET Framework 2.0 targets the Microsoft Windows Vista™ Operating System. This is an enhancement to provide additional support for managed services that do not manage their own service state during shutdown.
The Vista™ Operating system can experience delays during shutdown if running a managed service that was designed with a ServiceBase.OnShutdown method that does not explicitly call the ServiceBase Stop() method on system shutdown. This update facilitates quicker system shutdown by explicitly setting the service state to stopped after calling their OnShutdown, if the service has not already called the Stop() method.

http://www.microsoft.com/downloads/details.aspx?FamilyID=3a7b7298-37e6-4edf-a017-09a6bbc75287&DisplayLang=en