Without knowing if you have tried this, and not knowing the version of your Limewire, I ask: Have you tried checking the settings of Limewire itself?

Click Tools->Options

A few steps that may, or may not work:

1-Then go to Speed. Have you set the speed correctly? This may be telling people you have a slower or faster connection than you have and then they send you and you send them wrong information. That is never good.

2-Connections: Try disabling connect on startup. This will allow the program to start fully without having to try to find a connection right away. Try connecting manually.

3-Filters->Hosts: Check that you haven't inadvertantly blocked so many hosts that Limewire has a hard time finding any.

4-If none of this works, try checking Program Data (a hidden folder in Documents and Settings under your profile name) for a folder named Limewire. (I don't have any, but different versions can do completely different things). If it's there, go to Add/Remove Programs and un-install Limewire first, then delete this folder. Find a folder, probably at root, named Incomplete and delete this. Move any files you have in your download folder and delete this too. Re-install Limewire.

5- If all the above doesn't work, if you haven't yet tried it, disconnect the cable or de-activate your modem/network card or wire-less connection and re-start. Be sure you have downloaded Limewire first. Do step 4 (or as much as you need to) Connect the cable or activate your modem/network card/connection and re-start Limewire.

6- If you have more than one firewall, disable all but one. Firewalling firewalls causes too many problems

That's it from me. If you haven't gotten it to work now, I'm at a loss.