invalid cd key error

[OrionBOTS]

My brother installed act of war, when logged in on his account.
When logged in on my account, I get a "wrong cd-key error, but I don't feel like reinstalling it, because then he will have the problem.
How can I fix this?

[tank666]

when i was installing the game when i got to the imput cd key i put the cd key in and it said invalid how can i get a new 1