New and neophyte and only slightly paranoid so I 'm wondering about erasing. If Eraser is used for unused disk space over time is there a cumulative effect of the passes? AND I never considered where all this stuff might be stored and couldn't definitively ascertain by reading all the posts (not because they are not clear but because I am not clear)--does one have to run Eraser thru specific files in registry, outlook, thunderbird, explorer, and firefox? If so, what else? (Not worried about investigations but I would hate to flop over dead and have people read my musings and searches).