I found this and this worked great for anyone who was having this issue...

"I did a search in files and folders and windows found gnutella.net I right clicked on it and renamed it to gnutella.old I closed the search box and fired up limewire and it connected like it used to before after about 30 seconds. Thank you very much for your post, everything else I tried from this thread failed to work. very simple solution to a frustrating problem, thanks again. "

Hope this helps it helped me big time!!!! Good LUCK!