(a) I hope you are aware that Tiscali have a policy of shaping p2p bandwidth. This is most likely the reason for your problems connecting. Tiscali is listed here ISP's known to BLOCK or Filter p2p or specifically Limewire

(b) Make sure your XP firewall is turned off if using Norton. They will clash & result in less security & other side effects. So make sure Norton is configured to allow LW; Configuring Norton Internet Security

(c) (a) If LW Will Not Connect, __ (b) Problems with the search, __ (c) Hostiles List