Visual Studio.NET has detected that the specified Web server is not running

Hi brothers,
I have a pre installed .NET framework in my computer and my operating system is Win XP.
Recently I have installed my Sql and apache server and tried to test some web applications under .NET environment, but I have encountered with an error message

Microsoft Development Environment
Visual Studio.NET has detected that the specified Web server is not running ASP.NET version 1.1. You will be unable to run ASP.NET Web applications or services
Need immediate help to solve this problem.
