Hi,
In order to remove the Admin rights from the guest account, please follow these steps:
On the Keyboard, press the Windows Key + R.
Type lusrmgr.msc and click on OK.
Once the Window opens, click on Users in the left pane.
Double click on Guest.
Click on "Member of" tab.
Select Administrator and click on Remove.
Click on Apply and then click on OK.
Restart the computer.
Now the guest account will no longer be part of Administrator.
Hope this solves your query.
Regards,
Edwin S |Tech Support Team