Not a Relic post, not a Relic-sponsored post, I'm just the moderator here.
I upgraded to nVidia's latest drivers (364.72) and I was able to launch both Chaos Rising and Retribution with no issues. Tested with Retribution twice in a row. Could anyone else try this and report back?
Please make sure the driver version is accurate (again, 364.72, release date: 28/03/2016); the last driver update they offered was genuinely terrible and I had to roll back for the first time in (literally) years.
All feedback welcomed. I'll update this post if I start crashing on startup again.