Evertime you delete the LW preferences called .limewire, LW will create a new set as soon as you open it. It holds info such as about our Tools>Options settings so everytime you delete the prefs you'll need to reset these.
You can try:
Force IP instructions & sample image within LW.
Go to this webite & tell us what happens (it should say test page was successful):
http://www3.limewire.com:6346/
You will need to double-check your zone-alarm. It's been known to cause problems & sometimes unpredictable ones for p2p.