Recuva gives you the option of securely overwriting files. This is useful if you deleted files using Windows Explorer (an insecure method) and want to ensure that they're wiped from your hard drive for good.
To securely overwrite files:
2. In the results window, select the files you want to securely overwrite.
3. Right-click the list and click Secure Overwrite Checked.
4. You are prompted to confirm the deletion. Click Yes.
Warning: You cannot recover files once they have been securely overwritten.