It might be annoying if you have a lot of mods, but I recommend redownloading them all, and updating them. I'd say update your mods, but I kind of don't think this is a mod issue if it's crashing Steam itself. I reinstalled Nexus after and restored the folder to be fresh but ever since this the game has become unstable. I spent my morning troubleshooting and taking out mods until the CTD stopped. Not sure if there was an update or something but I left my game in working order last time I played but now it crashes from every little thing. I took a 2 month break from fallout only to come back to my game being extremely unstable.
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