I believe there is an option in System Mechanic to get rid of duplicate files. Yes " Clean up error-causing and space-wasting duplicate files and drivers. Easily find duplicate files on your system to be removed." This is not free ware, but it also isnt too expensive. http://www.iolo.com/sm/
I believ there may be other programs out there, like BenchmarX or something...used to be on the maxpc cd...BMX i think...I think it had the same option under tools....I will look around though and see if there are other good solutions.