Thank you so much! I followed your instructions & removed Limewire from the program exception list. For anyone else who is having problems, here is what I had to do in order to circumvent the firewall in Norton 2007:
1. In the Norton Internet Security & Firewall Options dialog box under Personal Firewall, make sure you select the "Ask me what to do" option under "Firewall Processing" (The default setting for my program was "Automatically decide what to do," so I never encountered a Popup box that allowed my to permit or deny Limewire to run).
2. In the same Personal Firewall menu, remove Limewire from the program exception list.
3. As skyliner suggested: "open/start Limewire and a Popup box from Norton should appear asking if you wish to permit or deny this program -- click permit."
4. Restart your computer after this step or it won't work (I didn't think the changes I did had done anything until I restarted my computer the next morning and Limewire connected).
**My Norton program automatically configured the Limewire exception rule correctly. Those were the only four steps I had to take to get my Limewire to finally connect!

Thank you so much!