Whilst logged in as an Administrator if you cannot gain access to these folders from Explorer, you may have to have Permissions. Right click the folder/s and select Properties/Security and add the admin to the Permissions option with Full Control.
Surface Pro (2017) vs Surface Pro 4
Where HTML5 is headed next
MacBook Pro v Surface Pro 5
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.