Yeah, you are right. I am sorry to say that if you have arrived at the same point that I, which have already done everything and still not working, you are not going to get help in http://feedback.dayzgame.com/and in http://www.battleye.com/support/ . I have three days trying to fix this error and I've done EVERYTHING for dayz still out. SO, I want to say my possible fix without unninstalling windows from a person who could finally fix this shit: - He copied the system32 folder and SysWow64 from a recently installed windows on another pc, and some files can't overwrite but he fix the problem and dayz worked again. - MY FIX is I have installed windows 8.1 64 bits, keeping my personal files (And I dont needed to delete anything in my hard disk). Then DayZ works again.