I have a .NET 3.5 Web application on VS 2008 SP1 running on Vista Ultimate 32 SP1. I created an Application under the Default Web Site. So the url to the app is \"http://localho
For those encountering this with Visual-Studio 2012 or 2013 and/or Windows 8 or 10 do the following.
You have to add .Net 3.5 (or 4.5) to your Turn Windows Features on or off window. You get to it via:
Control Panel -> Programs -> Turn Windows Features on or off
Click the Asp.Net 3.5
and the Asp.Net 4.5
check box in the IIS > WWW Service > Application Development Features
folder.