Sorry but I can just repeat what 3run said. I'm using Windows 10 (x64) and A8 seems to work without any flaws.
Are you sure that it's not code related?
You could ask one of the persons who have problems if they could try a small A7 test application (without any of your game's code!). If the problem persists you can be pretty sure that it's indeed A7. If not then the problem is either the code, or one of A7's feature that are used in your game but not by the test application.