I've tried the C.D. Key. I've tried the little bunch of numbers at the bottom of the code sticker. Was there something on the back of the manual? This wouldn't be a problem but for the fact that my family owns a dog. This dog likes to eat things she finds lying around. Even things on my desk. Suffice it to say, I left the manual out on the desk and she ate the back page. If the back holds the serial number, I'll just have to buy another copy of the game. If, on the other hand, one of the numbers I've already tried was correct, why doesn't it work? I'm quite certain I typed in my email address properly. So that's not the problem. What's the problem here? If it helps analyze the problem, know also that I have Vista. If my number is gone, tell me so I can get a new game (this would be the back-of-manual, eaten-by-dog scenario). If, on other hand, it's an issue with something else I typed in, please tell me how to fix it!