Sorry, I meant
this one.
(C/P the wrong link.)
This can recover files. And/or view possibly recoverable files. And/or delete possibly recoverable files for good.
For general file erasing (secure overwriting) I use Eraser, linked a few posts above. Very good.
Once you have deleted a file (or folder) using Windows, ie just to remove the header, you have to overwrite the free space, several times to be reasonably sure they aren't recoverable. Eraser (And Restoration, my link) will do that, but you have to erase free space on the entire disk. Takes a while.