Okay, most of the Westell routers come with built-in firewall, for example the one here:
http://www.adslguide.org.uk/hardware...estell2410.asp
So, my advice for you now. First thing to do is to download the newest LW from here (4.12.4, has just been release, 1-2 hours ago):
http://www.limewire.com/
And don't worry if the website still says 4.12.3 is the latest version, it ain't.
Then uninstall LW and all your Java. Reboot. Then download the newest Java version from here (1.5.0_07) using the JRE offline installer:
http://java.sun.com/j2se/1.5.0/download.jsp
Install the Java, reboot and then install LW.
Then you come back here and go to this thread, which explains how to configurate firewalls:
http://www.gnutellaforums.com/showthread.php?t=51361
In general, after having the internal firewall configurated to let LW access the network, you will need to give LW some time to settle down. Can be anything from 2-60 minutes....
And if you still have problems after all that, then come back here and we go from there......
