ther is a programme called EXPOSED but ive been trying to find a LIVE download for it but havnt had any luck, but if you can find one its a great little app that finds music files videos, flash ads, infact alsorts.
Check Identical Files click here was recommended on this forum a few months ago & I downloaded the trial version which allows 10 searches before you buy. A great program but be very careful when deleting duplicates. Read the help files thoroughly before you start! If I use up the free uses I`ll get the paid for version.
It is a nice program but I found it a bit Hit & Miss at finding music duplicates and decided not to buy. Even with manual settings it wanted the files to be too identical - e.g. same in every respect. Music duplicates often have a small difference in file size or some other file info. Indeed this is usually the case if you have a track on a compilation and on the original album.