Unable to open Network System Preferences

When I want to open Network System Preferences I get the message "Your network settings have been changed by another application". When I click "OK" the message keeps reappearing. The only way out is a Force Quit of System Preferences. What does this message mean and what can be done about it?
Maybe it's worth mentioning that I had to reinstall Mac OS a few days ago due to a screwed up security update. Could it have something to do with that? Apart from this my iBook works fine and I have no networking problems.
Thanks for any helpful advice.
Paul

Hi John
That didn't work but thanks anyway.
In the meantime I found another topic under "Mac OS X Tiger" that I had overlooked before dealing with this problem. It obviously has to do with the latest security update.
Paul

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