Automatic Messagebox popup in c#.net

Question

Hi,

     I have to run a C# windows service in .net in which i have to generate popup message box reminder every one hour. i dont want to run it as a application, as each and every time we have to run it manually daily. i cant find a message box in windows service. can anybody please give me an idea of how to do it in an automatic service so that no manual process should be done. once they switch on the system, the service should start automatically and should generate popups once an hour.If anybody have anyother idea about this other than doing it in windows service, it is highly appreciated. I need the service once to be installed in the client's machine and whenever he switches on his machine, the message box should popup once in an hour as a reminder. I dont want the client to run the exe manually everyday. Pls help me with ur ideas friends.

Thanks and Regards
Vijayarajan.V