Title says it all really, I have been asked to restore some stuff from an old PC. The problem is that he has a ton of redundancy in a bad way, whenever he reinstalled or moved to a new drive he basically just moved stuff elsewhere and started new without going back through all the old data and moving it into the new spot to then be added to. He has a lot of different my document folders, my pictures, you name it. And they all look like each other but have a little more data in them till the next time he reinstalled or got a larger drive. What I'm hoping for is some kind of tool that will just sort through it all and give me the unique versions I can just grab. A visual deduplication if you will. Does such software exist in free form?