I have been playing Arma 2 Operation Arrowhead for a year now without any problems. However, last week i wanted to try out DayZ mod, i attempted to join a server but after twenty seconds of joining it told me "authentication Timeout". It now happens in every single server i join whether or not it's a DayZ server. I have tried running as administrator, reinstalling three times, deleted it from regedit, i have even installed the latest Beta patch to see if it reduced the error but i have had no luck. I would really like to play the game again as i am a fan of the arma 2 series. I have already Contacted Steam support as i bought Combined Operations from steam but what they told me to do did not work, i also contacted the Bohemia Interactive Staff and they told me the same thing as Steam support. I would Greatly Apreciate your help in this.
I also get the error's "Bad CD Key", "Session Lost", and when i try to start up Arma 2 Operation Arrowhead without Combined operations i get "Error Creating Direct3D 9 Graphical Engine".