Greetings Alygator,
My name is Carlo, I'm an Independent Advisor and community member like you.
I am also using Windows 10 pc. Let us work together to sort this out.
Here’s the steps you can try, check if there are updates needs to be installed install in your device, the exclusion should work .
-Press Windows Key + X
-Click on Settings
-Go to Updates and Security
-Check for updates and install all available updates in your device.
Once the update is installed restart your pc for the changes to take effect and check how it goes.
To know more about files exclusion and on how you can enable the files exclusion using group policy you can refer to this link below.
https://docs.microsoft.com/en-us/windows/securi...
I hope, the information above helps. Please let me know how it goes.
Have a wonderful day ahead and stay safe.
With Warm Regards,
Carlo T.