ISensLogon Interface in service showing notification after stopping service

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C++

service

Hello Guys,
I have ran into a problem in which the ISensLogon Notifications only gets called if I stop My Service.
Actually I have created a service which implements some code that need administrator privileges. Now I want to start the code when I logon in to the user session. So for detecting the logon & Shell Start Notification I have Written a ISensLogon Interface and Registered it.
My service auto runs at boot suppose to capture the notifications, I think it is doing That in the background as well, but the Interface Methods are only called when the service stops and the destructor calls the unregister function to unregister the interface.

I have used the Whole code from the mentioned here . Actually I have created a class file in my service and copy pasted the code in to the code as I don't know much about com interfaces.