Did you configure your firewall so it allows LW full access (advisable not to have 2 active firewalls b/c they can interfere with each other); Firewall configuration instructions (click on link)

Do this simple test for us. Using your browser go here: http://www3.limewire.com:6346/ The page should say 'Your test worked!'. What happens when you go there?

If you have configured your firewall & do that test & you can't reach that page, then it looks like your USRobotics router may need port forwarding. Can you tell us the model no. of your router?

Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up.

Is this a your 1st try at LW or is this a new problem with an experienced user.