DayZ ARMA 2 Mod - Invalid CD Key?

[T345]

Hi,
I just purchased the Bohemia humble bundle, and when I try to join a server on ARMA 2 or DayZ it comes up with invalid CD key?
How can I fix this so I can actually play?
Thanks,

 

[Digit]

I've had this a couple of times and if you just do a quick Google search for your exact issue you'll find lot's of people with the same problem, and fixes. What i had to do was to find ArmA 2 and Operation Arrowhead keys in my registry and delete them. Run both games again in order and all was fine again.

Edit: Just thought. Have you run both games in order first? ArmA 2 then Operation Arrowhead.