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Several windows password reset options:

https://techjourney.net/forgot-windows-administrator-user-account-password-recover-and-reset-password-in-windows-108-187vistaxp20032kntserver/

Reset Server 2008 R2 domain admin password:

http://www.howtogeek.com/106333/how-to-reset-your-forgotten-domain-admin-password-on-server-2008-r2/

Accounts: Administrator account status:

https://technet.microsoft.com/en-us/library/jj852165(v=ws.11).aspx