Well for starters you need to tell us what's going on

Is your LW properly connected??

You can't get music anymore...is the search not working??

Or, is the search working but songs won't download?? Do files not move into the download pane??

Or, do songs move into the download pane but sit connecting for ages & get stuck needing sources forever??

You see how it is when we have to start guessing...a PITA

First thing to try is: Delete LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will kill all of your settings within options, you'll have to go back through afterwards & reset things. If you're not sure of your settings, go through LW's tools > options & write them all down, so that you can reset things later.