I've been attempting to play Dark Souls 2, and after fixing a graphical issue by pasting "video.untrimmed_dynamic_cbuffers=1" in my boot flags, I'm able to play for about 2-4 minutes before the game crashes windows. I then need to restart the vm and continue. I've also attempted adjusting various graphics settings within in the game, but to no avail. Any suggestions for how I could fix this?