People, I'd recommend using this duplicate file finder to deal with unnecessary files on your hard drive. It has many functions, user-friendly interface, safety options and 100% efficiency.
There are some programmes for XP to find duplicate files. I wanted to delete music duplicate file I used the programme Clone Remover for such aim. It helped me. And not only for music files. For pictures, music and a lot of others. Now it is more free place on my PC Good luck!
I use this general purpose duplicate file finding tool: Directory Report http://www.file-utilities.com It can handle a huge amount of files - worth a look