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Oh no! I hope you get the issue resolved -- it really is a fun game. :D

Just had a look and apparently it's a relatively common issue. Although there isn't really any fixes except the typical update drivers, verify game cache, uninstall reinstall, etc...

I've personally found that when cutscenes are about to happen, the game freezes for 10 seconds or so and then starts. That's on my laptop. On my PC it'll go so far as to say "not responding" but then after waiting half a minute it resolves itself and the game runs fine until next time it's launched where I have to wait the half minute again.

So... Wait it out without alt tabbing. Okay, I'll give it one more shot.

So... Wait it out without alt tabbing.

Basically. xD

Hope it works!!!