Active Directory could not delete the following registry key. The default value of this key has changed because the forest ...

Active Directory could not delete the following registry key. The default value of this   key has changed because the forest functional level has been raised to Windows Server 2003.   Active Directory attempted to delete the existing key and use the new default 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.
  
  Additional Data
  Error value: 
  %5 %6
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