Windows 10: Popup coming up saying access denied automatically, why?

This thing pops up automatically on start of my PC when I close it ,It comes up again very frequently over and over again. I have no malware in the PC and I don't open anything on startup, it just pops up automatically. It's really annoying me now. How do I stop it?

:)

 

net user administrator /active:no keeps saying access denied.

Hi Rebekah,

It's possible that you're not using an elevated command prompt, causing the Access Denied error. We suggest following these steps to properly disable the built-in administrator account:

• Right-click the Start button.
• Choose Command Prompt (Admin).
• Copy and paste net user Administrator /active:no and press
  Enter. If the command isn't successful, please post a screenshot so that we can study it further.

Let us know if you're able to hide the administrator account after following these steps.

 

Access denied

Whenever I connect any pendrive or hard disk it says access denied for pen drive I googled got the solution for pendrive but I need to follow the steps everytime I connect give me the permanent solution and steps for hard drive access denied

 

Change Folder Destination access Denied

Thanks.

After following the steps suggested, I get the message "Access denied" in command prompt.

Please advise how to allow permission.