Enable or Disable Built-in Administrator in Local Users and Groups
NOTE: This option is only available in the Pro and Enterprise editions of Windows 10.
1. Press the Windows + R keys to open the Run dialog, type lusrmgr.msc, and click/tap on OK.
2. In the left pane, click/tap on the Users folder, then in the middle pane, double click/tap on Administrator.
To Enable the Built-in Elevated “Administrator” Account
4) Uncheck the Account is disabled box, click/tap on OK,