You could try to re download LimeWire and see if that helps. Make sure you get the latest version.

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LimeWire v4.12.6 Pro

Current version: 4.12.6
Beta version: N/A

Download LimeWire Basic

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News: New Version Release! as of (8/18/06) | Check out the Features History to see what's been changed.

Note: LimeWire has discontinued support for Mac Classic beginning at version 4.1. More Info