I'd suggest you see this Licence requirement (click on link)

If that's not the answer then try deleting your LW Preferences folder whilst LW is closed; instructions here: Fixes for Limewire

BTW you should not have 2 active firewalls. They can interfere with each other. Disable XP's firewall: go to the control panel, double click on Windoze Firewall, check the disable box

See the link at the bottom of the page here to configure Sygate to allow Limewire & port 6346 & Java: http://www.limewire.com/english/content/firewalls.shtml