danieeel,

For starters, Tiscali seem to be crap Check out these threads for more info:
I have found a solution to getting Limewire to work with Tiscali
Tiscali blocking Limewire
can't connect between 5pm-11pm
Tiscali & Limewire
Connection Problem - with Tiscali.co.uk

Check out these instructions for Norton, hopefully something will help.
PortForward.com - Free Help Setting up Your Router or Firewall
http://www.gnutellaforums.com/226610-post6.html

That sagem modem doesn't seem to have a firewall. Are there any other boxes that plug into your computer for connection to the net?

You could also try updating your Java, some people had weird issues with 1.6.0_01. Try this latest update instead. Use the JRE offline installer & remove your current Java before you install this one.
Java SE Downloads


steve hodges,

Are you connected properly (how many green connection bars do you see)?
If your connection is ok, try this: Problems with the search

And if that's no help, delete LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will kill all of your settings within options, you'll have to go back through afterwards & reset things.

If there's a connection problem, please give us your details.
System details - help us to help you (click here)