I posted this (again) in reply somewhere else, and access violations is one of those reappearing irritant things with windows:

IMO permissions are set 'wrongly' by windows. I regularly have to use 'take ownership', even while i run my whole system as administrator. Also once in a while i have to use Tweaking.com's Windows Repair AIO. And mark fix all permissions, running in SAFE mode.

Then USE 'take ownership' especially on the Program Data, User and even Windows folders after that. Quite often too also to do with running software from an external USB drive. Permission issues with Windows 7 were far worse, but Windows 10 is getting the hang of it too.

At times Juction Box also can fix issues with Program Data and double set 'shortcut junctions', but it's hard to understand how to use latter tool correctly; its kind of a programmers thing .... F