c0000005 is most frequently driver related, and when it isn't, it is memory related (though rarely in a way that doesn't involve drivers). If I remember correctly. Regardless. The FFX14 Configuration tool has a thing that lets you copy your system specs to the clipboard. Use that to post your system specs for us, and please let us know what your FF14 settings are at (draw quality, AA/AO settings, etc., etc.) That will let us know where to look.