The default value of the following registry key has changed because the forest functional level has been raised to Windows ...

The default value of the following registry key has changed because the forest functional   level has been raised to Windows Server 2003. However Active Directory cannot use the new default   value because the key already has a value.
  
  Registry key: %1\%2
  Current value: %3
  New default value: %4
  
  User Action:
  If you would like Active Directory to use the new default value, manually delete the above  key from the registry. If you want to retain the current value, there is no action required.
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