Because Microsoft SQL Server works as a service to the operating system, in order to use it, you must make sure its service has started. To check it (on Microsoft Windows XP Professional, Windows Vista, Windows Server 2003, or Windows Server 3008) you can open Control Panel and the Administrative Tools. In the Administrative Tools window, you can open the Services. In the Services window, check the status of the SQL Server (MSSQLSERVER) item:
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