I have just down loaded lime wire 4.18.8 to see if I was going to like it befor I spend the money. I have shut off my norton firewall and windows firewall but I still get no results when I type in an artist. What else could be stopping it? Dan

Don't pay for Pro until you're absolutely sure that you're happy with LW - use the free basic for a while first!! Unless you're looking for really rare files, you might not notice much difference at all between basic & Pro
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Is your LW connected properly (all green/blue connection bars)? If LW's connected, try the fixes below.

1. In LW go tools > options > searching > basic & check whether the 'show license warning' box is ticked. If it's ticked , 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 change all of your settings within LW's options, you'll have to go back through afterwards & reset things to the way you like them.
Vista users: LimeWire Pref Folder in Vista

If LW's not connected, try the fixes here.
If LW Will Not Connect
If nothing there helps, post back with your system details