Hi lwftl&w,
Yes, delete the whole LimeWire folder that's within Application Data. Make sure LW's closed first
Once that folder's deleted...start LW & it'll take you through the setup wizard again. If it doesn't connect, restart your computer & then start LW again.
If there's still no connection, try replacing that gnutella.net file which lives
inside the LimeWire folder (no need to delete that prefs folder again). Post #8 of this thread tells you how to do that.