Make sure limewire is shutdown completely and not still running in the system tray. Don't use the add/remove programs to uninstall LW. Go to the program folder, it should be found at C:\Program Files\LimeWire\Uninstall.exe. Double click the Uninstall.exe file. That should uninstall it.
If your still having troubles I would suggest doing a virus scan. Then have a look through this thread:
WARNING: Viruses on network you should be aware of!. In it is a link to
Norbies World, a site that offers free computer help.