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Have you tried running it through your desktop shortcut?
Try setting "Run as admin" in the game shortcut properties and launching it from that.
Try setting compatibility modes (XP for example) in the shortcut. If that doesn't work then send a ticket to our Support people, maybe they'll be able to help you out.
Here's the link:

https://www.gog.com/support/contact

Choose "technical issues with games" and Support should take a look at your problem.