with my antivirus disabled and steam as an admin with all of the arma exes as an admin it still comes up with the same error, but only with battleye enabled, if i run the game exes(arma3_x64.exe & arma3.exe) manually they open up with no errors.
having this same issue and have tried running every thing as an admin and changing permissions to the folders, only when launching the game with battleeye enabled does it have this error