Try the fix in this thread: To fix the limewire keeps popping up / no taskmanager bug do the following

There's a virus that causes LW to keep opening up on it's own, there's also one that prevents the options menu from being accessed. Do a virus scan. If your av doesn't pick up anything, try d/loading AVG free (click on link) update it and do a scan, then follow the prompts.

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If it ain't broke, fix it till it is!