Bad serial Key

[Chaosplayer4 0]

Hee Guys,

After playing dayZ today and meeting a kindly hacker that teleported us into the ocean and spawned us all kind of difference weapons

I started to have the problem:

Bad serial key, this is a error when i start up my game ( Arma II Operation Arrowhead. )

Have been trying to re-install the game in steam.

Also when I check in the regedit, under Arma II: OA i can't find the key or any date.

my Arma II still got all data saved.

Does any one know how i can fix the problem?

- Chaos