today was about to begin work on a brand new project of ASP.NET MVC in my Visual Studio 2010 on Windows 8, when I came across the following:
Microsoft Visual Studio
ASP.NET 4.0 has not been registered on the Web server. You need to manually configure your Web server for ASP.NET 4.0 in order for your site to run correctly.
Chan! new Windows 8 making mischief, but clear in reality was I that trying a few scripts I delete some features of Windows. So from the option "Turn Windows features on or off", simply choose which are necessary for ASP.NET 3.5 and ASP.Net 4.5 and ready!
If it is that, these days I fix one thing and break 2!
Saludos @ Home