I know what the Serial Number is. I certainly know my own Email address. So why in God's good name won't Impulse let register Sins? I've tried every variation I can think of on the number, and I've even tried changing the way I type my Email. Is there something I need to do with the game first? If I need to know where I got it from, tell me so I can give up. My parents bought it a couple of years ago, and they don't remember, and I never knew. As for our old Email address that we probably used, it is just that: old. It doesn't exist anymore. Does the game need to be activated? If that's the case, I'm definitely without hope. It'd be more money (albeit a mere pittance) for Stardock, though; I'll have to buy a new copy of the game!