Missscotland...A couple of things to try...
Try uninstalling your Java from the add/remove programs and then re-install the JRE 5.11 offline version....
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11
Also try configuring your McAfee security center with limewire...
Port Forwarding for the McAfee Security Center
Last but not least, Tiscali are known to shape your connection at peak times...
This thread will explain more...
Connection Problem - with Tiscali.co.uk Tiscali blocking Limewire