Where did you buy the game from? was it from our online store? if so it should have sent you automated e-mail with your CD key. If you haven`t received that - please e-mail me at firstname.lastname@example.org
with some details on your paypal payment and I`ll look up your CD key.
And if you have purchased from a different retailer - the CD key will either be at the back of the game manual included in the DVD.