Hello, I bought and downloaded Dead Money on steam earlier, and I have just got around to beating the quest "heist of the century", as I go to leave back to the bunker, the music plays for 5 seconds, then immediately crashes. I've disabled NVSE, ran a completely clean/no mod run, and made sure my drivers were fine and I'm still crashing at the same exact moment 3-4 seconds after the music plays.

I have not had that exact crash but have had similiar ones. What always worked for me was to right click on the game in you game library on Steam and then click properties. And then local files and then valiadate game cache. This solved a lot of crashes for me. Also, try restarting Steam and it may update on its own.