Hi there. Ok, you need to install an operating system. If you already have the discs, you can install it by booting from the cd. If you haven't got the discs, then I'm afraid you need to see your local pc retailer, and buy one.
There is a free operating system called Ubuntu. It's Linux based, but is free to download, and you can even order a free setup cd. You can download it from here:
http://www.ubuntu.com/
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