Are you using LimeWire 2.1.3? If you are using LimeWire 1.8 or below, I would strongly recommend downloading the latest version.

That said, I would also recommend using the LimeWire uninstaller (located in your LimeWire installation directory), and deleting all files in your LimeWire installation directory, except for any files that you have downloaded and would like to keep.

Once you have done this, try running the latest installer from the LimeWire web site.