Server Error in Application “DEFAULT WEB SITE”
HTTP Error 404.3 – Not Found
The 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.
Start -> Run -> appwiz.cpl -> Turn Windows features on or off -> Internet Information Services -> World Wide Web Services -> Application Development Features -> ASP or ASPX (check it and then click OK)