If you're not using your computer for business or a part of the large network, SP2 may not really be necessary for you anyway. If the previous suggestions didn't work then that really is puzzling. Are you a Pro user? You could try an earlier version. I'm not sure where the older pro versions are. But for the free version go here:
http://www9.limewire.com:82/download/ or you could try the beta version 4.1 (if you're a pro user there's a link at the bottom of your personal dwnld page):
http://www.limewire.com/english/content/beta.shtml
To know what each version added see here:
http://www.limewire.com/english/cont..._history.shtml