CD/trial key invalid, does not exist or is already in use
CD/trial key invalid, does not exist or is already in use, what can I do?

If you get a message stating any of these errors, please make sure that the CD key has been correctly typed in the account creation process. Here are examples of characters that are commonly misread and mixed together:
O vs 0 (zero)
B vs 8
L vs I
S VS 5
If you have made sure that mistyping is not the reason for the error, please return your copy to the retailer where it was bought and you should be able to get a new copy or a refund. If everything fails, file a petition.