A couple of things that may be causing this..
McAfee is one of them, disabling the firewall doesn't actually help with limewire and Vista...
McAfee Tech support have just recently posted a solution to the problem...
http://www.gnutellaforums.com/278483-post16.html
Try this solution and see if it helps you...If it doesn't post back and let us know...
Also you could have a Nat Firewall within your router, could you supply the model number for your Netgear so I can give you the instructions on Port Forwarding...