If You use ASP.NET, one of the first things you’ll want to install on Windows 7 or Vista is IIS (internet information server). Keep in mind that your version of Windows may not come with IIS. I’m using Windows 7 Ultimate edition.
First, go to Control Panel, and then click on Programs. You’ll see a link for “Turn Windows features on or off”

From: http://tutorialsland.blogspot.com/2010/05/install-iis-on-windows-7-or-vista.html