I had two laptops that couldn't connect. I accidently deperessed my routers wireless security wizard one night and bingo my Limewire was crippled. After port forwarding in the router, uninstalling limewire and updating to the newest version, adding the exception in windows firewall and tweaking settings in limewire for the networkcard and internal ip address etc... I was still unsuccessful.

I could however connect just fine on the wired desktop pc. This bothered me so I dug deeper and found the sollution for both my XP and VISTA laptops, if you fallow these steps exactly you will be successful too.

Windows XP

1. Completely shut down LimeWire by right-clicking the system tray icon located in the bottom-right corner of the screen. (You may need to expand the system tray by clicking the left arrow button).
2. Uninstall all previous installations of LimeWire from Add/Remove programs by going to: Start > Settings > Control Panel > Add/Remove Programs
3. Delete all LimeWire icons and installers from your computer (you may find some on your desktop).
4. Right-click the Start menu, then select Explore. Using the folder tree on the left side, navigate to the following directories, and delete them (you can right-click the folder and select Delete):
   
   
   
   Before deleting these folders, go to Tools > Folder Options >Advanced, then select Show Hidden Files.
   • C:\Documents and Settings\(username)\Application Data\LimeWire (where username is the name you use to log on to Windows)
   • C:\Documents and Settings\(username)\.limewire
   • C:\Program Files\LimeWire
5. Restart your computer.

Windows Vista

1. Completely shut down LimeWire by right-clicking the system tray icon located in the bottom-right corner of the screen. (You may need to expand the system tray by clicking the left arrow button).
2. Uninstall all previous installations of LimeWire from Add/Remove programs by going to: Start > Control Panel > Add or remove programs
3. Delete all LimeWire icons and installers from your computer (you may find some on your desktop).
4. Right-click the Start menu, then select Explore. Using the folder tree on the left side, navigate to the following directories, and delete them (you can right-click the folder and select Delete):
   
   
   
   
   Before deleting these folders, go to Organize > Folder and Search Options > View, then select Show Hidden Files.
   • C:\Users\(username)\AppData\Roaming\LimeWire (where username is the name you use to log on to Windows)
   • C:\Program Files\LimeWire
5. Restart your computer.