Oh how interesting. It sounds as if the install did not complete. I saw some posts having to do with install workarounds, so perhaps this is what you need to know about. Have you checked the other messages that make reference to this? I have not had this problem, so I can't help you exactly, but perhaps you should try FreeWire instead. It does not use the same installer (it is basically LimeWire, but no banners). Here is the link:
http://www.freewirep2p.com/