Directions for Use:

1.)  Take the following blue text, copy it, and paste it into a text  document.  Then, save it as EnableAuth.ADM.
Class USER
Category "Custom Policies"
  Keyname "Software\Microsoft\Windows\CurrentVersion\Internet Settings"
  Policy "IE: Enable Integrated Windows Authentication"
   #if version >= 4
    SUPPORTED !!SUPPORTED_IE6
   #endif
   Explain !!SetEnableNegotiate_Help
   VALUENAME "EnableNegotiate"
   VALUEON NUMERIC 1
                 VALUEOFF NUMERIC 0
  End Policy
End Category
[strings]
SetEnableNegotiate_Help="Enabling this policy is equivalent to checking the Enable Integrated Windows Authentication checkbox located on the advanced tab under internet options in Internet Explorer. IF REMOVING THIS POLICY: Reset to original setting and let policy propegate before deleting policy."
SUPPORTED_IE6="Internet Explorer v6.0 and newer"

2.)  Open a group policy management console (gpedit.msc), and right click on "administrative templates" under "User Configuration".  Select "Add/Remove Templates".

3.)  Browse to the text document you just saved and click OK.  You'll now see "Custom Policies" under "Administrative Templates".  Right click on it, select "View", then select "Filtering".  Uncheck the bottom box, labeled "Only show policy settings that can be fully managed".

4.)  Click ok.  Now you'll see the authentication policy available for use under the custom policy heading.  From there, you can enable or disable it just like any other policy.

Questions?  Comments?  Post them below as a comment to this article.