Bad Serial key in setup/cmd box when launching CO

[Headband 0]

So i just bought/installed ArmA 2 CO and I am having difficulties.

I have looked at just about every single thread pertaining to the installation, I have opened up ArmA 2 and i have opened OA.

But when i open OA i get an error message that says

Bad Serial key in setup and closes out the game.

Also when I launch CO the cmd box appears and then nothing happens.

Any thoughts or advice would be greatly appreciated

Running ArmA 2/OA though steam

On Win7/x64

[fox808 40]

Try running STEAM as administrator.

[Headband 0]

Tried that. Its still not working

[Sakke1994 0]

Started both ArmA II and OA once before starting CO?

[Legacy (DayZ) 1091]

Started both ArmA II and OA once before starting CO?

This. I was told to run the game once before launching as CO.

[Headband 0]

Still getting bad serial key in setup when i open OA

[Headband 0]

Got it to work. But when i go to join a server

It loads up and then just bring me back to the select a server screen...

[Headband 0]

Bump^^^^^^^^^^^^^^^^^^^^^^^^^^

seriously i wanna kill some bandits/zombies

[CooKiee 0]

I have the same problem apart from mine says bad serial when i try to open arma 2, but works fine when i go to open Arma2 : OA

also, when i try to join a DayZ game, it says you cannot play/edit this game it is dependent on downloadable content that has been deleted.chernasus

anyone know? thanks

[Zorlop 0]

Nevermind - fixed :P Didn't realise my install of ArmaII CO had failed, just had to reinstall :-P