Duplicate Cleaner is very simple to use. Select a ‘search path’ (My documents, any folder, etc) and add these in the ‘Search Paths’. Then, select file filter option, then, choose any option (example, same content) under ‘Find Files With’.
You can also specify maximum or minimum files size, then click ‘GO’ button to scan the duplicates. You can then remove the duplicates.
The scanning process is impressive and it works with Windows 2000, Windows XP, Vista and Windows 7. Duplicate Cleaner can be downloaded free at this link.