Earlier quoted context omitted.
Pirating Windows is pretty stupid these days. You can download the official MS ISO from their website, and buy a real key from some subreddits for like $20. The keys they sell are those bulk keys large companies get, their IT dep guy wants to make some extra coin on the side. But they work.
Also: - if you bought a laptop with preinstalled Windows, you can activate a fresh install with the key that's stored in the laptop (in ACPI tables IIRC). Just make sure it's the same edition and language. - if you're a student, check if you have DreamSpark (er, Imagine) Premium. Apparently Windows Server is available even in the non-Premium program (for all students).
Free tool we developed to quickly grab that key: http://neosmart.net/OemKeyTool/