Hi, I can't start ARMA 2 OA because Steam doesn't write a key into my registry... I have already reinstalled the game and worked out the Forums troubleshooting guide with no success. Wrong CD Key You get this error when running the beta patch, the way i fix it for users is to: Exit Steam Run Steam as Administrator Right Click ARMA 2 > Properties > Local Files > Verify Integrity of Game Cache | Let it run Launch ARMA 2 let the game load to the main menu, then exit. Right Click ARMA 2 Operation Arrowhead > Properties > Local Files > Verify Integrity of Game Cache | Let it run Right Click ARMA 2 Operation > Set Luanch Options | Remove any text that is located in there, then close it. Everything is ok until this step. Launch ARMA 2 Operation Arrowhead (NOT COMBINED OPS) let it load to the main menu then exit. If i try to launch Operation Arrowhead it tells me " No entry 'bin\config.bin/CfgInGameUI/MPTable.shadow' ". then i can click ok Arma continues loading and my screen turns black for a part of a second and then i get the error " Error copmiling pixel shader PSSpecularAlpha:0 " Get the beta file Right click > Run as Administrator and let it install. So i skipped it and tried to install the latest beta patch and the Patcher tells me "Wrong CD Key" At least i checked my registry and there i have been able to so whats the problem. HKEY_LOCAL_MACHINE -> SOFTWARE -> Wow6432Node -> Bohemia Interactive Studio -> ArmA 2 I found the Key for arma 2 in the registry but for arma 2 oa HKEY_LOCAL_MACHINE -> SOFTWARE -> Wow6432Node -> Bohemia Interactive Studio -> ArmA 2 OA was no Key written into the registry. I can see the folder in the registry but nothing is in it -.- So can anyone tell me how to get my original Steam Key written into my registry?