I have made sure that every expansion has been selected and in use. Yes, I followed a youtube video tutorial and such, that told me to copy everything in the arma 2 free folder into a OA directory in a folder called "Arma 2" Yes, I made sure to run both A2 and OA/CO before installing dayZ, I'm 99 percent confident steam is running in admin mode, however i'll test that. And i'm 100 percent certain you can play with arma 2 free. I own arma 2 retail.. but that was just 100x more problematic...