IIS settings problem

I have installed IIS on my windows7 but it is some problems with it. I successfully can open html files like (http)://localhost/index.html , but can't open ASP site: (http)://localhost/ProjectList.aspx

HTTP Error 404.3 - Not Found
The page you are requesting cannot be served because of the extension configuration. If the page开发者_开发百科 is a script, add a handler. If the file should be downloaded, add a MIME map.

What the problem? (I have already reinstalled .NET 4.0)

Maybe it is another way to wath my website? Like with the help of Visual Studio 2010?

make sure that the windows feature for IIS are switched on to allow .net

if on winodws 7 then click

start -> control panel -> programs -> turn windows features on or off - > Internet Information Services make sure the following options are switched on

Have you tried %windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i ?