It sounds like you have fake Ultrapeers, which in return will leed you to fake files and such....

Try going to your Connections Tab in limewire, if it's not showing up go to Veiw > Show/Hide and make sure the connection tab has a tick next to it...
Then click on the Hosts and remove them and let Limewire search for some more...
(try to take note of the hosts IP numbers if the same ones keep re-appearing add them to your host filter...)

Tools > Options > Filters and select the Host Filter and add these IP's into it and select apply...

Another thing if you are using limewire 4.13 and later you can apply this hostile list...
The TechNutopia Fullsize Hostiles List for BearShare and LimeWire

Also do you use PeerGuardian at all....
If not install it and turn it on before you start limewire up...
Peerguardian __(FREE)

Another thing I did notice is that you use Norton Internet security 2007...
Have a look through these instructions and just check that everything is configured correctly to allow Limewire, you never know maybe a update could have sent things a little haywire....
Port Forwarding for the Norton Internet Security 2007

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