1. Security filtering using GPMC

You have to install the GPMC for 2003 but in 2008 GPMC is available in any DC.

Remove the Authenticated users and add a  security group, find the screenshot for the same.

See the below links for implementing  the Security filtering. You will get the step by step information with screenshots.


2. Another way for GPO exclusion.

3. Also you can use "Item level targeting" for GPO exclusion.
GPO Troubleshooting

Also you can use the ADM/ADMX for GPO related issues (GPO DEBUG LOGGING).


http://www.gpoguy.com/FreeTools/FreeToolsLibrary/tabid/67/agentType/View/PropertyID/84/Default.aspx Use this tool for registry key change.


I have tested all the above tools and all are working fine.