I was having the exact same problem. I had already tried to Uninstall & Reinstall idea but that did not resolve it. Then I found the following information on a web site ( User Cant Connect - LimeWire ) & it seems that performing the last step before you restart & reinstall, which is deleting the directory ( C:\Documents and Settings\(username)\Application Data\LimeWire for XP users and C:\Users\(username)\AppData\Roaming\LimeWire for Vista users), is what resolved it.

Here is the information from that web site:

Full Uninstall & Reinstall

If modifying the settings in your security program does not fix the connection problem, try doing a full uninstall & reinstall of the LimeWire software. This will often resolve connection issues related to security programs blocking LimeWire or unreliable connections to the Gnutella network. Please make sure to follow these instructions COMPLETELY to ensure a full uninstall/reinstall.

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.
6. Redownload LimeWire (or LimeWire PRO if you previously purchased it) and run the installer.

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.
6. Redownload LimeWire (or LimeWire PRO if you previously purchased it) and run the installer.

Hope this helps!

Jeff

Information listed above obtained from the following web site: User Cant Connect - LimeWire

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