for spares, and I am not sure if I should leave the operating system on or not. Its Windows 2000 Pro (!) and works fine other than the fact sometimes randomly the keyboard sticks so you get a random oooooooooooooooooooooooooooooooooooooooooooooooo
or ccccccccccccccccccccccccccccccccccccccc that you cant stop (cleaning under the keys didnt work).
Basically I just want to be as sure as possible that all my data is wiped off. What is the best way to do this?