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 o

I've received error message when try to open visual studio.net.
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

I suspect some of my newly installed application cause the webserver port change from 80 to others. My case is easy to solve, i uninstall my newly install app called: "Raysource" and it's work and running.

For more information on this error, please check in

http://support.microsoft.com/kb/817267

http://www.dotnetspider.com/kb/Article2476.aspx