moving to Flash Player forums
From where did you download Flash Player for Windows 8.1?
Have you enabled the Flash Player add-on? Did you disable ActiveX Filtering?
I did not install the player; it appears to be baked in to IE or is a part of Windows updates. I see that it was installed (last) on 8/7/2014...I did not install that so it had to have come through some update of some sort.
The player is DISABLED right now. Enabling it causes IE to crash continually.
Yes, Active X filtering is (and has been) disabled.