here are my system details:
Windows XP, Zone alarm Firewall, 1GB ram, 46GB hard disk available, home Broadband connection, webstar modem thru virgin, limewire 4.18.3 java 1.6.0_07, simple test is ok, this is not shared with another computer and it is a new problem i've just encountered, can see a brick wall in front of world icon, avg 8.0.138 anti virus and operating from uk.

Hope this helps.