1000 Screaming Badgers

It happens when I join any server, Battleye will initialize, then right below it will say registration failed: invalid cd key. I can join the sever but I will get kicked after a couple of minutes or so. I used Dayz Commander to install everything and hid any servers with wrong versions of dayz/arma. Dayzcommander updated the game to 1.63 but that also gave a wrong cd key error, although it installed the update regardless.

I just bought Combined Operations during the recent steam sale and every time I join some server it gives that error, and I get kicked a couple of minutes later. This is pretty ridiculous. What do I do to get it to stop this nonsense?