With the passage of time (especially if you use the computer very often) or imagine the large amount of duplicate files that you can have on your computer for having copied and pasted from one place to another, which for the only thing that is useful is to take up space on your hard drive and cause absurd redundancy of repeated files on your machine.
To eliminate all that redundancy that is expendable is a program like DuplicadosEraser, free and in English that stands out above all for the tiny size (just 15 K), which consumes very few resources and space, and will be responsible for scanning your hard drive in Search for repeated files that can be deleted, allowing you to delete those that are duplicated (and not worth anything).
DuplicatesEraser is usually quite fast doing that scan, but sometimes (depending on the size of the hard drive and how full it is) it can take several minutes.
You can free download DuplicadosEraser 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.