How do I format my PC?

  Fruit Bat /\0/\ 20:40 14 Aug 2014

I think I need a CD or something with my Operating System on it so I can install it

Yes you probably do. also a driver disk and all you install files for your programs.

First back up all your important files as everything will be lost when you format the drive.

You may have a hidden partition containing a system image that will return the machine to factory settings (the day you got it)

Make and model? operating system?

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