if all you want to do is erase your browsing history, do what Jdeadevil said
Quote Originally Posted by Jdeadevil View Post
If you have Firefox: Go to Tools - Clear Private Data
If you have Internet Explorer Go to Tools - Internet Options - Browsing History - Delete - Delete All

Then run Disk Cleanup and put a tick on all the boxes.
this will leave you with a fully operational system
(if you intend to give the machine to someone else)

It will still be possible to retrieve this information
(difficult, but not impossible)
but for all intents and purposes, unless your giving the machine to a Comp.Sci. student, your browsing history is gone

If you want to fully destroy all information on your disk
(leaving you with a non-operational "blank slate")
follow Identity X

This will leave you with absolutely nothing
and you will need to install an operating system in order to use the machine