Sorry, I have never heard of this problem before, so I cannot help you much. However, there are a couple of things/workarounds that might work.
1) Instead of taking the tutorial mission you can skip it. If this is the only problem you have this might help you continue your game.
2) Upload a save game just before the crash. I can try it and see if it works ok on my computer. If so I can save the game right after the hero has left the tutorial cave, and you can continue from there, hopefully.
3) Make sure you have no mods activated in your game. Then refresh your game files from Steam. This is to remove mods and corrupt game files from being the cause of your problems.
4) Upgrade your graphical driver to the latest version.
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