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That error is due to Windows permissions. Revo Uninstaller likely left behind remnants of the old Calibre configuration, which the new Calibre can't access.
Try restarting your PC.
In File Explorer, type %APPDATA%\calibre and press Enter. Delete only the store folder. It only stores temporary data for book stores, so nothing will be lost.
Open Calibre; it will recreate the folder.
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