If you don`t want people to know what you`ve done in front of the PC, and you want to preserve your privacy and confidentiality, you need a program like Keep your privacy 3.0. It deletes all traces you`ve left, eliminating stored data and other information residue that is always left after using a PC.
It deletes browser histories (IE, Firefox, Opera, Netscape), cookies, temporaries, caché, instant messaging conversations (ICQ, iMesh, ICQ, etc).
Its deletion method guarantees the impossibility of recovering that data, even if they use specialist recovery tools.