As I am often using Limewire for hours while doing other things, I often forget what I've already downloaded. That is why I need the feature that tells you when you try to download something you already have. I accidentally hit the checkbox that turns it off when it came up once and did not realize until I had already closed the window. Now, I don't know how to turn it on again. Please help.

In the preferences (or tools->Options) there's a checkbox under View->Pop-ups to reset the defaults. Useful, right!

Cheers