That's a subject that contravenes the forum policies. So I locked this thread.
But I see a working and tested Windows 7 machines for less than $20 at ebay, for example http://www.ebay.com/itm/COMPUTER-Core-2-Duo-2-8-GHz-4-GB-DVD-80-GB-15-MONITOR-Win-7-OFFICE-49-Ship-/262417695789?hash=item3d1950442d:g:8XcAAOSw2ENW62OO
So let me suggest you to research the second hand market for Windows PC. Much cheaper than Windows itself.
i am currently on linux Ubuntu 14.04 but need windows for various reasons. I am unable to buy a legit copy as lack of money so i need a cracked version but not too sure on how to do it. Any help would be greatly appreciated.