Make sure XP's firewall is disabled (go to the control panel, double click on Windoze Firewall, check the disable box.)
Double-check your zone-alarm FW:
Firewall configuration instructions (click on link)
You're running a network. How many comp's are using LW? Did your forward a port? If you forward a port, you can only use that port for one program per comp (AFAIK.) So you'd need to open a separate port for the other computers to use LW.
Oh I just read here
http://www.adslguide.org.uk/hardware...q3/bt-2000.asp that your bt uses UPnP. That should in itself allow LW full access since LW is a UPnP program.
But if you did the following test & your browser timed out then something's wrong. Using your browser go here:
http://www3.limewire.com:6346/ The page should say 'Your test worked!'. What happens when you go there?