Where is the serial code for this game located at?

[AceTong]

lol. Well first off I accidentally screwed up in that first post, I met to also say this game was a download off of amazon.com, I didn't buy a boxed copy of it(couldn't find any so had to download it). The second thing is I just recently found that I did indeed have the serial number for the game the whole time it's just amazon placed it in a really strange place. I have a new problem though however.....when I put the serial code into where it wants me to, the game will not accept it. Always tells me "activation failed" after it......I've read online other people have had this strange problem too, is their anyway around it? Do you know? Anyone else?