Hello,
Just as a short introduction, I am a Windows System Engineer by day with extensive experience in System Administration and Desktop Support.
I've looked at the youtube link you attached and believe I will be able to fix the issue as it looks like it is being caused by File ACL Permissions.
I will be able to do what the youtube video does and follow up with any additional changes to make it work via Screen Share / Team Viewer if you chat with me.
Thank you and I look forward to hearing from you.