You just got 1.5? How'd that happen?!! That version... well... we'll just say it has some issues. ;-)
I don't think I can help you with "The Phantom File." Sorry! :-) But I would recommend getting LimeWire 1.6x. You'll encounter many, many other problems if you continue to use 1.5. Trust me. I know firsthand.
Other sites may say you are getting the newest LimeWire, but many download sites are outdated and have old versions posted. Try this link and see how your luck goes.
http://www.limewire.com/index.jsp/download