Yeah this is an ancient issue, though WIndows 7 can make it even worse by storing copies of files.
On the one hand being able to recover them from accidental deletion has saved probably millions of peoples skins

On the other, making sure that sensitive personal information is completely wiped from a drive is potentially dificult.
It is technically possible to wipe individual files from normal hard drives, so there is probably a tool out there to do it. (time to google) You need to do it before you delete the file though.
(As an aside, SSDs add a new wrinkle to the process that may leave parts of files recoverable even if your "zeroize" them using traditional tools O.O)