Can you provide me a link to your site (mhorton@telus.net) so I can see for myself. As long as you've enabled it in the settings (Admin->Authentication) you should see a Windows Login button.

Yeah I checked my web.config and found that there were two httpModules named Authenication.  One was  the section all of the help documents say to uncomment and  the other I assume was placed there by the install of AD.  I changed the Name of one but  that definitely doesn't help.  I then get this error:

Configuration Error

Line 62:     <!-- HttpModules for Common Functionality -->
Line 63:     <httpModules>
Line 64:       <add name="Authentication" type="DotNetNuke.HttpModules.AuthenticationModule, DotNetNuke.HttpModules.Authentication" />
Line 65:       <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
Line 66:       <add name="Compression" type="DotNetNuke.HttpModules.Compression.CompressionModule, DotNetNuke.HttpModules" />

I installed DNN 4.81 source.  I got it up and running.  I then followed the steps in your guid to install Active Directory.  Now when I go to my site I get the error below.  What do I need to do to resolve this?

Server Error in '/CiscoPortal' Application.

---

Value cannot be null.
Parameter name: path1

Line 70:         Public Sub New(ByVal DefaultType As SkinDefaultType)
Line 71:             Dim nodename As String = [Enum].GetName(DefaultType.GetType(), DefaultType).ToLower
Line 72:             Dim filePath As String = System.IO.Path.Combine(DotNetNuke.Common.Globals.ApplicationMapPath, glbDotNetNukeConfig)
Line 73: 
Line 74:             Dim dnndoc As New XmlDocument()