Sign into Windows or start Active Directory Users and Computers with domain admin rights. Locate the Administrator account. Right click on it and select Change Password.
Or
You can go to properties and select option user must change password at next login , it will also help you...
Last Wiki Answer Submitted: March 5, 2013 8:10 am by Denny Cherry64,505 pts.
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Thank you so much, Mrdenny! I will give it a try and post how I made out.
Reset Windows server domain administrator password is alittle complex.
I just see this article for Active Directory Administrator password recovery.
You can have a look.