Adprep failed in the attempt to add the Anonymous Logon SID to the Pre-Windows 2000 Compatible Access group. Status/Consequence ...

Adprep failed in the attempt to add the Anonymous Logon SID to the Pre-Windows 2000 Compatible Access group. [Status/Consequence] For backward compatibility, Adprep requires that the Anonymous Logon security group be a member of the pre-Windows 2000 Compatible Access security group if the Everyone group is also a member. On Active Directory Domain Controllers running Windows Server 2003 or newer, the Everyone group no longer includes Anonymous Logon. [User Action]  Check the log file ADPrep.log in the %1 directory for more information.