I have tried repairing the installation but it finds nothing wrong, but it does pop up with a Window saying something about the "Nvidia Inspector"?
Hmm, from what I found in the net, playing in windowed mode could resolve the problem. But don`t take it for granted.
Maybe you should try to start it without galaxy.
I have tried starting it without Galaxy, doesn't work. And I can't even start it, so I can't set it to run Windowed.
Really disappointing for this supposed "optimized for modern PCs" port.