EXPLANATION This message should occur only on a down-level computer. Any action to correct the problem should be performed ...

EXPLANATION    This message should occur only on a down-level computer. Any action to correct the problem should be performed on that computer.  The user accounts database file is missing, so the backup file made at the listed date is now being used. Changes made to the user accounts database since this time were lost. Local security is still in effect.    ACTION    To update the user accounts database, retype changes made to it since the listed date.