I bought a Windows 7 Ultimate key but it did not work. Kept getting a security error. Sent in screenshot as requested, but was only asked to reinstall windows from their link - which I did again. But the key still wouldn´t work and kept getting a security error upon trying to activate it. I contacted CJS CD Keys but they just asked me again for yet another screenshot of the error. To which I replied that I had already sent a screenshot and for the cost of 6 pounds it wasn´t worth the hassle again. So I bought another key from a different supplier which worked a treat. Personally, I think the problem is on the Microsoft Windows 7 servers, as couldn´t even download patches, but unfortunately, CJS CD Keys failed to help, only wanted constant screenshots. For this I wouldn´t recommend of use again. Pity