You might want to do a search for threads with Windows Defender and/or Controlled Folder access.
Quick and dirty answer would be to make sure calibre is not running. Create a new folder called Calibre in your User folder (C:\Users\username\). Move your calibre library folder(s) from Documents to Calibre. Start calibre and use the Switch/Create Library option under Library with the Use the previously existing library at the new location to connect to your library/libraries at the new location.
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