I've had the SAME problem. I don't know the source of it either. I'll try to close Limewire and it will close.. but 10 seconds later start up again for no apparent reason. I know for a fact it's not a virus. But something to do with Limewire itself. Some glitch? Or something I'm not getting.

It just opens up randomly and when you close it - pops back up again. Quite annoying.