Firstly, is your LW connection ok? Is this your first try at using LW or has it been working well before? If you just can't get connected, you need to read this & follow all the advice
http://www.gnutellaforums.com/showth...threadid=51357

If your connection's fine but you can't get any search results, try deleting the LW preferences. Instructions here
http://www.gnutellaforums.com/showth...threadid=36420

You can also try going tools > options > speed & disabling ultrapeer capabilities. Set your searches to show all qualities. Within tools > options > searching, set your number of simultaneous searches to 5 or so.