After setting up your computer for the first time, be sure to create a set of recovery discs of the full factory image. The recovery discs are used to start up (boot) the computer and recover the operating system and software to factory settings in case of system instability or failure. While the steps listed here are for a Compaq PC with Windows Vista, different manufacturers have slightly different instructions and these will give you a general overview of the process.
http://www.wikihow.com/Create-Recovery-Discs-for-Windows-Vista
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Hacking Windows 