I tried to uninstall it, but it won't go away. It's still on my computer, still sharing files with other people, and I can't get rid of it. What can I do?

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.

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