I'm having no difficulty with the Base ending. That seems to work fine.
My problem is after Charlie has left the Alien Base, and I want to save the game. After many minutes, the game is stuck on the Save/Delete scrteen, hence Task Manager. A game restart does show a saved game with the correct label, but trying to load that saved game also hangs my computer.
I, too, have an SSD drive (which I love), and all my Nvidia drivers are automatically updated.
Slinger