Deleting files in Windows doesn't mean that they are permanently deleted from the hard drive. Windows leaves behind a shadow that later can be restored by a recovery software. If you want to permanently delete such files you can use utilities such as Eraser. Another similar application that is portable and opensource is the FileKiller. It completely removes a file from your disk without leaving any track. It is very fast and overwrites any deleted file with blanks or random data N times - where N is given by the user.
Click the "Select Files" button to select the individual files to delete and then select the overwrite sector method. You can either use random data or blanks to overwrite the original track. Now to start the permanent deletion, hit "Kill Files on Grid" button.
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