Go 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...
http://www.gnutellaforums.com/open-d...-limewire.html