I was getting that error message, too, and updated the firewall connection as per the LimeWire site instructions to get around it. That didn't fully work and so I deleted the .limewire file in Local Disk/Documents and Setting/User. Then I changed setting not to connect on starting and got rid of the tips pop-up box.
Plus, I had the previous version and installed the most current version. Not sure if that made any difference, but it's worth a try.
So far I've gotten a pretty good connection and have gotten the "your computer" message once, but it seems to have worked itself out for the moment.
What I've also noticed is that even though that message comes up, songs are still downloading
It's been very frustrating since (blush) we're still on dial-up.
We've installed Mozilla as an additional browser and I thought that might have been the problem, but so far, ok.