(https://blog.switchfast.com/solved-windows-10-upgrade-changed-all-documents-to-read-only)
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Go to “File Explorer” (documents). At the top of File Explorer, there are three menu tabs: home, share, and view. Click view. All the way down to the right, click the options button. Then click “change folder and search options”
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A new window will open with three tabs: general, view, and search. Click on the view tab. You will see a long checklist – go to the “hidden files and folders” folder and check “show hidden files, folders and drives.”
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Further down the checklist, you will see “hide protected operating system files (recommended)” – uncheck this. A warning box will pop up – click yes.
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Click the “OK” button in the opened window and you’ll be back to your file screen. On the side menu, click “this PC” and then click the “local disk” icon. From there, click the “users” folder. In the users folder, find the folder that has your username and right click Scroll down the menu that appears and click “properties.