if the converting to MP3 did not work then try this

when you download the Mp3 don't launch them from within Limewire but instead close limewire and go to your shared folder in the Limewire folder which should be in your harddrive somewhere and double click on the MP3 file. a window should pop up asking which application you want to open the file in, CHoose Itunes. if this doesn't work !!!!!!

Then open Itunes and go under File Menu and select 'Add to Library' and then find the Mp3 file and it should work.

or better yet go to the 'edit' menu and select 'Preferences'. Under the 'General' Tab and hit the button beside where it says 'use itunes for internet music playback' that's it. the next time when your in limwire launch a file from the shared folder and it should play in itunes.

good luck.