Although my question may have already been answered....
I have Limewire installed on my computer and it has been working fine for some time. It seems to have peacefully coexisted both with Windows Firewall and Avast!, but some days ago, it started showing a message that claimed that Limewire was being blocked by a firewall.
Although I have Limewire on my exceptions list for Windows Firewall, I deactivated it just to make sure and the problem was not solved. I suspect that Avast!'s P2P shield is the source of the problem but I can't find a way to configure so that it will stop blocking Limewire.