此電腦上針對安全性更新的週期性掃描失敗。系統管理員必須確定 Windows Server Update Services 伺服器可用，並且此電腦上的 Windows Update Agent 已設定為與該伺服器同步處理。

The periodic scan of this computer for security updates failed. An administrator must ensure that a Windows Server Update Services server is available and that the Windows Update Agent on this computer is configured to synchronize with the server.