So you also configured your XP firewall: http://www.limewire.com/english/content/firewalls.shtml

What brand & model number of modem/router do you use?

Your XP, does it have the SP2 update. If yes, is it since you installed it you've been having problems?

By the way, if you are now a legitimate pro user, why not try the LW beta 4.3.3 This version fixes a no. of issues (some major). You can downld it from the bottom of your personal downld page.