Directory Service Cannot Start

Win2K Server, SP2, sole domain controller in a small office. Rebooted the server this morning, when it came back up we got this message:

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We reboot into Directory Services Restore Mode but cannot log in at all to do anything. We get a login prompt and attempt to log in as administrator with no luck. Articles I have found online seem to indicate that we should be able to log in and check the log files but we are completely shut out. Any help is greatly appreciated.

Andrew