1. OS version? XP Admin
2. What firewalls you have? McAffee Enterprise 8.5
3. How much ram? 1 GB
4. Hard Disk space available? 7.39 on C, 97.5 on E
5. Connection type? Cable
6. Modem & router brand name & model numbers? Motorola SBG 900
7. Where are you trying to connect from (house, appartment complex, school, student accomodation, work, etc.)? HOME
8. What version of LimeWire LimeWire 5.1.3 Pro
9. Who is your ISP (Internet Service Provider)? Time Warner / Road Runner
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? Your test worked
11. Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up. no
12. Is this a your 1st try at LW or is this a new problem with an experienced user. 1st try with LW. Used uTorrent
13. Do you see a brick wall in front of the blue world icon at the bottom of LW's interface? _ click here to see Sample image
If you're using LW5, there's no firewall icon. In LW go tools > advanced tools...there you'll see whether you're behind a firewall or not.
Click on thumbnail to enlarge the image.
Yes, behind a firewall

14. For those using a modem/router, how is your modem/router set up...are you port forwarding or is UPnP enabled? Port forwarding
15. What security programs are you using (antivirus etc)? Some people might not be aware that their security suite includes a firewall McAfee 8.5
16. What country are you living in? Sometimes there are ISPs with the same name in more than one country (eg Clearwire in the USA & also in Ireland). USA
17. Has anything in your setup changed recently? Have you updated your version of LW or Java? Have you added any new software or new hardware? Have you updated any software? Have you moved house, changed internet plan or ISP etc etc? ALL NEW

When you port forwarded the Motorola, did you set up a static ip address first? This is a must, else the port forward rules would need to be removed & redone.

Have you set up an exception for LW in the McAffee firewall? Setting up an exception for LimeWire in your software firewall (click in link)

Did you disable XP's firewall?

Try the suggestions Birdy made here: If LW 5 Will Not Connect