Open LW and go to Tools>Options>Searching>Basic, Tick "Show License Warning" > apply > ok. Then try d/loading something.
See:
License Warning Option.
If they go to the d/load window but won't connect, then they're probably fake files. See:
Fake files showing up in search results
Also see:
Problems with the search,
How to find music (also tips for video)
How is your connection? Do you have blue or green bars in the lower left corner in limewire?