hi,
yeah i had the same problem - only i had zone alarm installed too.
Dont really know why it eventually worked - cos it dont make sense - heres what i did-

1) uninstalled zone alarm
2) ran limewire (wall shows up - 1 bar)
3) turned windows firewall off
4) closed limewire
5) opened limewire (no wall - full connection)
6) turned on windows firewall (wall returns - connection stays)
7) reinstalled zone alarm

hope it helps

piiing

ps i didnt bother with the listening port malarky either ( something I'd previously tried too! )