It's often better to start a new search, rather than trying to resume an old one. Your old source may be offline. Try a new search, vary your search terms a bit, chances are that you'll find a few new sources. There are some tips here to continue files downloading
http://www.gnutellaforums.com/showth...#post%20139889

http://www.gnutellaforums.com/showth...aiting+sources

You should read the sticky at the top of this page "Configuring LW for optimal performance" & there's one in the dl/ul problems section about maximising dl/ul success

*Don't try & download 15 files at once unless you have a super fast connection!! Try dropping it back to just a few at a time