When I click "Connect to Database" I get this error..
http://www.rugbyleaguenz.com/Trade/error.JPG
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When I click "Connect to Database" I get this error..
http://www.rugbyleaguenz.com/Trade/error.JPG
The operation is trying to write something, maybe an error or maybe just information, to the Windows event log and it can't because it's full. You need to first clear some space in the event log so that the operation can write to it. If what's being written is an error message, you can then read it there.
You can get to the Windows Event Viewer via the Control Panel. There you can clear individual logs if required, but a better bet would be to configure the properties of the logs to automatically delete old entries when they are full. That way you'll never encounter this issue again and you won't have to delete possibly useful log entries.
EDIT: Actually, I see that you already have the Event Viewer open.