when ever i type something in to download, nothing comes up. NOTHING. How do i fix this?!

Do you mean you're not getting any search results? Try these fixes:

1. In LW go tools > options > searching > basic & check whether the 'show license warning' box is ticked. If it does, untick it > Apply > ok...see if that makes any difference.

2. Problems with the search

3. 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.

Or...do you mean that when you click on a search result, it doesn't download??