How do you switch it? I never get any downloads when searching. Thanks for the help.

The network chooses you to be an UP if you're not firewalled (ie don't see the brick wall in front of the blue globe next to LW's connection status), have a fast connection & if the network needs UPs. You'll automatically switch to UP mode when the network needs you, providing you have the option enabled - tools > options > advanced > performance > make sure that 'disable ultrapeer capabilities is not ticked.

Do you mean that you don't see any search results? Or do you mean that when you click on a search result to download, nothing happens?

I dont see any search results.

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

Wow. I think the first option worked. Thanks Im going to bookmark this page.