If you've been wanting to upgrade to Windows 8 but baulk at paying then, firstly, you're a bad person but, secondly, now your opportunity's here. Microsoft just screwed up and handed out a free activation key for the OS.
Microsoft is letting Windows 8 Pro users upgrade to Media centre for free until January 31st. Neat. But in so doing, it's handed out a code that will fully activate any copy of Windows 8. Oops. The Verge has even tested it out and is confirming that it works.