I didn't have this problem, but I have in the past with other steam games. Have you tried completely removing all traces of RO2 from your computer and then re downloading/installing the game? Perhaps something from the beta release is conflicting for some reason. Steam is picky like that
proper graphic card drivers are installed on your machine?
Try turning bInitializeShadersOnDemand=True to False in roengine.ini.
Done that, still crashes instantly upon loading the map.
Hmm that kind of crash is usually a memory problem. Try textures at medium, and make sure theres no background programs running. Not just exiting antivirus and stuff, but also stopping their services.