Microsoft Flight Simulator Product Key Microsoft Flight Simulator X "Invalid CD Key"?

Microsoft Flight Simulator X "Invalid CD Key"? - microsoft flight simulator product key

Hello, I just bought FSX Deluxe Edition. The installation went well.
But if I start on about the game, which means that my valid product key. I checked 10 times and I know I have the right and keeps saying invalid. I can not even go to the activation page.
I have just bought this as 3 hours and said it is not valid.
I'm trying to find the e-mail or phone number of the gaming service by Microsoft, but it seems that every hidden. And they want to pay again for their support.

If someone can help me here, or if someone knows a solution or service information, contact the Microsoft games to them via e-mail and we'll replace the product.

I'm pretty disappointed now.

To thank you for it in advance.