Hello,
To remove All his personalized stuff as far as the web goes that is on the computer, On the internet toolbar, you will need to click Tools/Internet options.. Here you will see a button named Delete.
Click that button, you will see a new box, at the pottom of that box, click delete all, and checkmark the box that says delete add ons.
This will remove all the cookies, and everywhere he has been from the machine.
Take note. This will also remove all password for websites, so if you have forgotten any, you will have to reenter them in the next time you visit them.
Hope this helps.
Michael
Computer Hardware Engineer
Certified Dell Tech-7 Years, IS Support- Principal