I am a new user of computers thus i dont know too much. I have recently got Eraser. I share this computer with 2 other novice users and this computer is 2nd hand. How do we erase files that have been deleted in the normal way in the past by the previous owner using the delete function and recycling bin. We have heard that this method does not remove the files from the computer. Does the erase un used space from Disc C do this?