How to remove duplicate files in Windows XP?

Hi,
I found myself have a bunch files on my computer so that I don’t organize them well. Sometimes I keep the same files, twice or more in difference folder, drive or somewhere else. Now I need more space on my computer, so I have to remove some files. May be the MP3 files is my first target, but how can I do that? Does Windows XP came with such feature or need an application to be installed?
