Your easiest option (as ive already said above) is to disable windows firewall and download zonealarm http://www.filehippo.com/download_zonealarm_free/

Well download it first and install it before you turn off windows firewall, when zonealarm is working start limewire then a box should pop up saying limewire is trying to connect, click on "accept" and thats it, should work fine then
Im using limewire/zonealarm combo so i know it will work