Well you might try to see if you delete them in safe mode. It might delete it once you have done it in safe mode. Also do a full scan in your computer. within the safe mode.
Also try to refrain on every time you are using the limewire downloader. because you are really putting your computer at risk every time that you are using it in your computer. Try read this sites newsletter to know what is the most kind of virus that you get in while you are using it. http://systemsecurityinstitute.org/