And I need to pick up Windows 7 somewhere, probably Amazon.
I'm going to be completely honest, you should see if you can find a friend or relative who wouldn't mind lending you the install disc, unless you really want your own copy of it.
You could always try Ubuntu, which is a Linux-based OS but free.
http://www.ubuntu.com/
Though you'd be really limited in what you can do.
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Oh brilliant blade of cold as steel, rend the infinite darkness and crush my enemies to nothing... SAVAGE WOLF FURY