What is Windows Defender?

[Kordakh]

Heres the deal i know how to format a computer... i have done it a million times but this time i have come across a new problem and im not exactly sure how to deal with it. I know that when you completely wipe a computer you have to wait for the prompt during start up that says "press any key to boot from disk" but what happens when you dont see that message? How do you format it then? Yes i am trying to wipe xp in order to reinstall xp (nasty virus tried EVERYTHING else) any more info needed just let me know... If it helps at all my computer is a Lenovo daily motivation daily motivation daily motivation daily motivation daily motivation daily motivation daily motivation