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My game was also crashing on boot like the anon above, so I decided to remove the heaviest mod folder from the game and see what would happen.
In this case it was my CC folder. Game launched just fine after that. I went to the LL forums and saw some other people also had crash issues with CC enabled for a couple months now and it seems tied to nvidia drivers.
Doesn't explain why my game crashed today considering it was working just fine yesterday and I've changed nothing, but maybe it explains the other anon's problem.