From Wizard Industries:
This program is a security file shredder. Its purpose is to prevent others from breaching your privacy or stealing your secrets. Its method lies in removing all traces of any sensitive files from your hard disk, beyond all hope of recovery. Sure Delete can obliterate all aspects of an individual file and even wipe out entire folders in one operation. Sure Delete includes a user-selectable level of security and can clean your hard disk to make sure the files which were not removed with Sure Delete can't be recovered, either.