I have tried 3 times (first 2 was just setting compatibility of program and trying windows and full screen mode. Third time was when I tried GFX as arm died for the first time. Screen would disappear and it gives me visual C++ error and just shuts down its client. (first 2 attempt however, first one did gave me C++ error full screen mode but window mode did not. But window mode just shut down as if I am alt F4ing client if that make sense. Both of first 2 run I didn't do GFX only started that on 3rd attempt). I am running on windows 7 64bit. I will probably try twice more on window more when I get chance to as I have 2 more setting I would like to give a try. Buy any idea or thing I should attempt to try on my setting to avoid client from shutting down during zakum? Thank you.
If you are using a Nvidia graphic card that could be the cause of the problem. I would suggest trying out VMware, here is a great guide for it. http://royals.ms/forum/threads/how-to-horntail-without-graphical-glitches-closing-your-client.16643/