While i was hosting ASP.NET website in iis7 i got the following error message. I am just sharing the steps i followed to solve the error
HTTP Error 404.3 - Not FoundThe page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map.
You just open control panel as shown below
In the control panel you open windows features section as below
Just refresh the page after finishing following step