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Why does shredding system files not remove all the selected files?
Windows and many open applications are constantly using various temporary files. Since these files are in use, they cannot be modified by other applications. As a result, the operation "Shred System Files" will usually generate the result "Operation completed with errors". If you wish to remove more files, simply restart your computer and try again. The operation "Shred Free Space" can also be used to ensure that there is a bare minimum of sensitive temporary files on your system.