Have you just downloaded/installed LW version 4.16 -- if so delete the LW Preference Folder : In windows XP they can be found here:-
Make sure your Limewire is closed
Preference File in XP SP2 (you must show all hidden files)
[1] Open windows explorerselect Tools à Folder Options à View à Show hidden files and folders.
[2] In windows explorer look for the Limewire Folder – go here:-
c:\documents and settings\username\applications data\LimeWire <--(delete)(or)
c:\documents and settings\username\limewire <-- (delete)
Vista Users will find it here:-
C:\Users\your username\AppData\Roaming\LimeWire <--(delete)
Vista -- how to find hidden files (vista hidden files)
Now restart your Limewire