From command line: "runas /user:administrator powershell
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From powershell:
Windows PowerShell Copyright (C) Microsoft Corporation. All rights reserved. PS C:\Users\username> Install-ADDSDomainController -CreateDNSDelegation:$false -Databasepath 'C:\Windows\NTDS' -DomainName 'YOURDOMAINNAMEHERE' -InstallDNS:$true -LogPath 'C:\Windows\NTDS' -NoGlobalCatalog:$false -SiteName 'YOURSITENAMEHERE' -SysvolPath 'C:\Windows\Sysvol' -NoRebootOnCompletion:$false -Force:$true -Credential (Get-Credential DOMAIN\USERNAME)