If you've got a broadband connection, 'modem' setting's probably wrong for you

You can do a speed test here (only have your browser open when you do the test).
Speedtest.net - The Global Broadband Speed Test

Once you know your speed, have a look at the thread below...it tells you what speeds suit the different options in LW.
http://www.gnutellaforums.com/genera...tml#post114034

Just so you know, a lot of TalkTalk customers have had problems with using LW. There's more info here
Is that it then, TalkTalk

ISP's known to BLOCK or Filter p2p or specifically Limewire

1-3k downloads

ISPs that throttle p2p - The Scream!

If you find you're having trouble, try downloading during the hours this person suggests.
TalkTalk UK ISP blocking p2p