How do i fix these problems.

All Picture (Photos) i've scanned or loaded when i've photoshopped or edited or even renamed sometimes i'm left with 2 or 3 of the exact same file only all different names (same extension. eg: jpeg)

How do (whats an easy way) of finding Duplicate Files and deleting all but 1. Same with Itunes or any music, files, they all 'share' libraries import/export. How do i manage music files so I only have 1 copy of 'every' song and not 10. Everytime i make a new CD & rearrange songlists it seems to duplicate OR does it just appear to look that way, but all playlists share one file?

Sorry about the grammar. My mother is asking for help, but i am rather tired and have no clue on how to help.

:)