I need help with norton utilities functions...

I just downloaded a trial version of norton utilities and ran it. When I ran the find duplicate files feature is when I ran into my issue. I have no clue of how to proceed at the point of where it asks me what files I want to delete? It lists all these files it says are duplicates but I'm scared that I might delete the wrong file. Any help with this would be greatly appreciated. Thank You,

Kathi