安全性帳戶管理員 (SAM) 判定這台電腦的安全性識別元 (SID) 已在您想要加入的樹系上使用中。當使用不正確的備份來還原 Active Directory 網域控制站時，就會發生這個情況。請在本機 AD DC 上重新安裝作業系統，以取得新的 SID。
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English version
The security account manager (SAM) has determined that the security identifier (SID) for this computer is already in use in the Forest you want to join. This can happen when restoring an Active Directory Domain Controller with an improper backup. Reinstall the operating system on the local AD DC to obtain a new SID.
Windows