TL;DR: The Data Shredder Stick Secure Data Wiping Tool can wipe hard drives on Windows PC’s for just $39.99 (MSRP $59.99).
To make sure a deleted file can't be recovered, you'll need to use a third-party shredding tool. Here's a look at three such free programs: Eraser, File Shredder, and Freeraser. We all know that ...