Hello all. I just recently purchased Sins of a Solar Empire: Trinity on Steam. When I went to launch the game, I entered the CD key given to me by Steam and I got the message, "Invalid Serial Number". I re-entered the CD key SEVERAL more times, making sure to enter it exactly right. I kept on getting the same message, "Invalid Serial Number". Now I am very frustrated because I followed all the instructions on the Stardock website about registration and I still cannot play the game that I paid for even though I did nothing wrong.

Please, if anyone knows what might be wrong, help me. I don't know what else to do.