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I cannot access the domain security policy, and in Active Directory I can't edit the default domain policy Windows 2000 domain. When I try to open the default domain policy, it gives me an error that I do not have permission. On the group policy tab in AD, the edit function is grayed. Group policy is working okay, but I need to make a change. This was a NT domain that has been upgraded to 2000 then switched to native. I am not sure when the access problem occurred, and I am not receiving any errors in the event log.
A corruption in the GPO's ACL has occurred. I'm not sure there is an easy solution. You may be able to delete the GPO file through Recovery Console, and then import a new un-changed version of the Default Domain GPO from another system.