Windows 2008 R2 restarts on own, no errors logged

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http://serverfault.com – In the last 2 days my dedicated server (Windows Web Server 2008 R2) has crashed twice and restarted. I've looked in the Event Logs and there's nothing logged leading up to it.I'm very technical, but not a trained server administrator. I have a dedicated server since my site is active enough to require one. Since nothing is logged, how am I supposed to determine the cause of it so I can prevent it from continuing to happen? It's not Windows Updates, automatic updates are disabled. It's definitely a crash because in the Event Log I see: "The previous system shutdown at 9:25:13 PM on (HowTos)