Windows 10 My Quick Access Toolbar and Notepad Background become black

Yeah it looks like part of your system is stuck in high contrast mode.

I would right-click on the desktop and select "Personalize"
On the right hand side click on "High contrast settings"

If it's on, turn it off, of it's off turn it on and off again.
 
Should be the lighter colors you see in the bottom half of the file explorer.
 
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