I was under the impression Norton stop developing their firewall for OSX. Perhaps it's just Tiger they stopped developing it for. (I thought it wasn't totally compatible with Tiger 10.4)

I presume you'll need to manually add limewire/gnutella to the firewall. You didn't specify an OS version so, check how to do it with OSX to get an idea for Norton's firewall; OSX Firewall settings for Tiger

Did you also check this issue? QuickTime 7.0.4 bug stops LimeWire from opening!