Do the following:
Navigate to C:\Windows\System32\AppLocker
Delete the contents of the folder. It will ask for Administrator permission, click yes. If you get an error that you can't delete file(s), you will need to boot into Safe Mode, then it will allow you to delete the files.
So far, even with current updates, everything seems to be back to normal.
Fix posted on Reddit https://www.reddit.com/r/Windows10/comments/9fybz2/shell\_experience\_permission\_error\_fix/
This worked for me. Thank you redditor Hairbear2176
This worked for me as well!