OK a few things I see...
ZoneAlarm has had some affect on connecting...
This link will explain, follow the directions the user has posted...
http://www.gnutellaforums.com/281366-post6.html
Also if you are using ZoneAlarm Pro use these instructions to configure it correctly with Limewire...
Port Forwarding for the Dlink DI-604 (Don't take any notice of the link title, it is for ZoneAlarm)
Also your Netgear Router more than likely has a Nat Firewall within and will need to be Port Forwarded, so if you could supply the model number, I will be able to get the instructions for you...
And last but not least, your ISP Talk Talk are not all that p2p user friendly...
** Must subscribe to £9.99 International package. Non LLU add extra £15. £35 for adsl service only. 8Mb only provided on LLU exchanges otherwise you will get 2Mb QoS/Throttled/port blocking *advertise unlimited but have cut their customers off without warning. They haven't defined any limits but their T+C's 4.5 state:-" we may change your Transmission Speed or manage your use of our Broadband Service as we see fit in the circumstances. Heavy users are throttled