Not the issue: SQL Server restarted and our web sites are running now.  I am trying to find out how to prevent this from happening again.

Thank you for your efforts.  We have two databases running on the same instance of SQL Server.  They are not very large with plenty of free space.

The Error messages after...

There were no errors reported before the incident.  The Server had backed up as normal an hour earlier.  The next log in SQL log is that the Server was shutting...