1. OS version? Vista
2. What firewalls you have? Just the Windows firewall
3. How much ram? 1G
4. Hard Disk space available? Around 30G
5. Connection type? (eg: dialup, broadband, cable, etc.) cable
6. Modem & router brand name & model numbers? Modem is a Motorola Surfboard SB5101, router is a DLink DIR-660.
7. Where are you trying to connect from (house, appartment complex, school, student accomodation, work, etc.)? I'm at home.
8. What version of LimeWire (LW) & Java do you have? 4.14.8
9. Who is your ISP (Internet Service Provider)? Comcast
10. Do this simple test for us. Using your browser go here: http://www3.limewire.com:6346/ The page should say 'Your test worked!'. What happens when you go there? It says the test worked.
11. Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up. Nope
12. Is this a your 1st try at LW or is this a new problem with an experienced user. New problem, experienced user
13. Do you see a brick wall in front of the blue world icon at the bottom of LW's interface? Yes, but that's always there.
14. For those using a modem/router, how is your modem/router set up...are you port forwarding or is UPnP enabled? UPnP
15. What security programs are you using (antivirus etc)? None at the moment
16. What country are you living in? USA

In LW file > disconnect. Wait 5 minutes then file > connect.

Delete LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will change all of your settings within options, you'll have to go back through afterwards & reset things. If you're not sure of your settings, go through LW's tools > options & write them all down, so that you can reset things later.

Are you using the same version of Java now as you were when LW was connecting?

You could try port forwarding for your router. These instructions are for the DI655, have a look & see whether the instructions suit your model.
Port Forwarding for the Dlink DIR-655
You'll need to set up a static IP address first, or port forwarding won't work. LW's listening port, port in the 'manual port forward' box & port forwarded within the router should all be the same number.