You know that you have them but you don’t know where... And that’s when Anti-Twin comes into scene. It is a really comfortable application which lets you find all repeated files in your system.
It scans the selected folder in a matter of seconds (it depends on the folder) showing us the files identified as repeated in the main window.
Once that list of file is complete, select them and destroy them... or not, that’s up to you.
Anti-Twin can scan the full HD, an specific folder or compare two paths.