duplicate files deletion:easy clean

hi i just downloaded easy clean and proceeded to clean up my registry amongst other things. when i went to duplicate files it came up w/a boat load of them.

they were in sets of 2. both more or less the same file. i didn't delete anything cause i don't know if both are duplicates of the original file or 1 of the 2 is the duplicate and the other one the original.

can anyone help me by letting me know which to delete? are all the files that show up duplicates of the original?

all replies appreciated as always.