You've probably read this, but just in case:
http://www.gnutellaforums.com/showth...threadid=51357
Have you configured your firewall for LW (& made sure you're not running 2 firewalls together)? Have you deleted the limewire preferences folder? Have you reinstalled Java & LW using the "offline" installers? Are you getting error messages? Are you seeing the firewall icon? ????????
Rather than having a rant, maybe you could describe your problem exactly, along with exactly what fixes you've tried.
No-one can help you unless you give some more info.