Yes you can use any port above 10000; use UPnP.It's recommanded.
Actually there's plenty of advice on this forum on how to set your Windows firewall, or that of of your antivirus, or your router, but it appears that sometimes LimeWire is behind a firewall even after everything has been set properly. My hunch is that an old antivirus software is still there somehow even you think you got rid of it for another one. Also don't use several firwalls (Windows, antivirus, router)