Although I have had Ccleaner for some years, I have just tried for the first time, the Duplicate Finder. Assuming the list shown were duplicates, I started marking with a tick, all of those shown. However it went on and on, to the extent I have got cold feet as to what I might be doing. Most of the files shown seemed to be for 2009. Advice please. Do I proceed and delete them all or not? Many thanks.