I recently upgraded from windows 10 to 11 and since then, when ever I turn on say Might and Magic VI - The mandate of heaven on the GoG launcher and turn the game off at some point, the screen goes completely white, I see nothing on the screen, I have to restart the computer to fix it. Anyone know what it is that causes this?

Maybe this might help you:

https://grayface.github.io/mm/#GrayFace-MM6-Patch

try windows compatibility mode.

thank you, this fixed all 3 MM games for me, now I only have Heroes of Might and Magic 3 Complete left to fix. I tried that one too and it too turned my screen white

For HoMM3 you can use the HoMM3 HD Mod:

https://sites.google.com/site/heroes3hd/