The more knowledeable of you will know about this, but for those that don't, microsoft doesn't allow you to delete files permanently, when you empty your temporary internet files they are not deleted they are moved to a secret (hidden ) file.
This program enables you to see everything you've ever clicked on to.It's made me think because I'm just about to sell puter and get a new one, which means that if the person I sell it to knows what he's doing, my life becomes an open book whether I want it to or not.
http://www.fsm.nl/ward/
P.S. It's the 1.6 version if you want to download and have a look.