MsPinkFreud
Unfortunately, most if not all modem/routers now have built in firewalls and it is this firewall that LW detects.
You will have to go through the "Port Forwarding" process to allow LW full access to the internet and P2P network, there is no other choice.
Therefore, go to this URL:
http://www.portforward.com/help/portforwarding.htm
Find your modem/router and follow the instructions to "Port Forward" LW.
UK Bob