Missing "Pre-Windows 2000 Compatibilty Acces" Buit-in Group



I am trying to run adprep /domainprep /gpprep and get the below error:
I have looked in the built-in account for the domain and the
"Pre-Windows 2000 Compatibilty Access" account is missing therefore I
can not add everyone to it. I NEED HELP!!!
Is it possible to add a built in account?



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 domain
controllers running Windows Server 2003, the Everyone group no longer
includes Anonymous Logon.

[User Action]

Check the log file Adprep.log in the system root
System32\Debug\Adprep\Logs directory for more information.

Adprep encountered a Win32 error.

Error code: 0x5 Error message: Access is denied..



Adprep was unable to update domain-wide information.

[Status/Consequence]

Adprep requires access to existing domain-wide information from the
infrastructure master in order to complete this operation.

[User Action]

Check the log file, Adprep.log, in the
C:\WINNT\system32\debug\adprep\logs\20061109142105 directory for more
information.

.



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