It is against the policy of BleepingComputer to provide information on methods to reset or bypass the Administrator password. Though your question is most likely legitimate, there are others who may read this topic and use the information for less savory reasons. It is for these reasons we do not provide this type of information.
If you have any questions, please feel free to send me a private message or an email. Thank you for your understanding.
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Reference: BleepingComputer Board Rules