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Acrobat 9 is very old and not compatible with Windows 10. Problems are to be expected.
Your best chance is to run it in Compatibility Mode with a previous version, like Windows 7 or even XP.
It successfully is running on another windows 10 Machine (same Windows Build) without Compatibility mode.
I tried Compatibility mode (tried Windows 8 & XP SP3) on the machine that did not help.
That's exactly the issue. It might work perfectly on one machine and not at all on another, or it might work perfectly one day and the next day all kinds of problems might happen. Because it's not compatible there are no guarantees as to how (if at all) it will work.
And since it's not a supported version there won't be any fixes or updates for it. If it works for you, great. If it's not, you're basically out of luck.