Hi there. For me is quite the same. It looks like theres some fishy things going on with steam interacting the game. I did everything you did, but at the end i got a refund from steam, the i said myself id give it another go. Uninstaling steam [if you plan to do that don't forget to backup your games using the steam backup functionality, otherwise just copying the games folders won't work], then i installed steam on a new folder in "C" so my new path now is C:\\Games\Steam, instead of the default C:\\Program files. Doing this allows me now to play up to 2 hours before that crash error happens again. It happens most commonly afterloading screens between campaign missions or most commonly when playing strikes or other activities with other people (oh and i do not do that checking the error prompts me to do) Hope that helps you play a bit the game before they patch this (altough its been since forever, sin e this error was there even on the battle net louncher, now more commonly on Steam...)