okay, i was hoping on getting DayZ working on my computer. I downloaded Arma2 free from the offical website. then bought operation arrowhead from Gamesrocket.com. i looked at someone named kodabars (or somthing like that) install guide for DayZ and one of the steps for the non steam install was to run both: Arma2 free and OA after install. arma2 free works and startsup fine, however when i try Operation Arrowhead i get an error code saying. "Data file too short C:\program files\bohemia interactive\Arma 2 Operation Arrowhead\expansion\addons\ui.pbo. expected 31968514 b, got 1233977" im not the smartest guy but i know i messed up somewhere. i do know that another step before was to copy the addons folder from arma 2 free to Operation arrowhead. while doing this i got another error code saying.. "cannot copy sound: data error (cyclic redundancy check)." So if anyone could talk me through what i did wrong i would be entirely happy. it might also help to let you know i have used the six updater for DayZ and i am confused on the step with beta patching. so please help if you can. :D