Do you mean the program disappeared? If yes, then it sounds like you're using a spyware program that's not p2p program compatible. Perhaps like the Yahoo or AOL spyware such as this http://www.gnutellaforums.com/showth...739#post180739
If yes, then disable it & get these instead: 1. ad-ware (FREE), & also 2. Spybot - Search & Destroy (FREE)

Make sure you have the most recent Java. If you have a very large no. of incomplete files, then perhaps you should consider Tip: Purge the Downloads Queue! as that will give a fresh breath of new life to LW.