Are these Torrent or Gnutella network files?

Best method is to re-search the files as you did when you were originally searching for them. In that way you can find fresh hosts of the files. Also 5-10 mins later, right-click the search tab & choose Find More Results. _ The Fix Stalled option basically only attempts to search for the hosts it was originally downloading from, so if they are offline or busy you are stuck.