Application in which I want to send message to local user

Helo guys I want to create one application from scratch where I want  if anybody login to system I want to display the system generated POP up message ( "dont update install any software") . 

 

please suggest in which language should I do this project , I was thinking to do it in ASP.net , if anyone have ideas or reference code please help me out.

I don't really understand your question as there isn't enough information available to formulate a response.

What are the application requirements, Desktop App, Web Based, etc? What beyond displaying a popup message will this application do?

ASP.NET is a set of Microsoft .NET classes that allow you to write a web based application that runs under the IIS Web Server. The user interface will be in a browser and the application will be running on a server.

Is this what you want?