I recently upgraded from player version 16 to 16.1 which is running under windows 10

I have installed windows 2000, windows XP, Windows 7 & Windows 8.1. However i am receiving a notice to disable sidebar mitigations when starting up any of them, furthermore windows 2000 is very slow starting but can run but the others cause problems and interfere with my power supply, am on a laptop.

I wonder if any one can kindly inform how to disable the sidebar mitigations in player 16.1, or can i reverse to player 16 where all ran ok. Thank you