Basta abrir o Windows PowerShell ISE como Administrator e executar o código abaixo alterando o que precisa, pois da forma está ele irá criar o diretório MyNewFolder e dará FullControl para o grupo Users:
$FolderPath = "C:\Program Files (x86)\MyNewFolder" # Change folder name to another one
$objType = [System.Security.AccessControl.AccessControlType]::Allow
$colRights = [System.Security.AccessControl.FileSystemRights]"FullControl"
$InheritanceFlag = [System.Security.AccessControl.InheritanceFlags]"ContainerInherit, ObjectInherit"
$PropagationFlag = [System.Security.AccessControl.PropagationFlags]::None
$objUser = New-Object System.Security.Principal.NTAccount("Users") # Change Users group to another one
$objACE = New-Object System.Security.AccessControl.FileSystemAccessRule ($objUser, $colRights, $InheritanceFlag, $PropagationFlag, $objType)
New-Item $FolderPath -ItemType Directory | Out-Null
If (Test-Path $FolderPath) {
$FolderACL = Get-Acl $FolderPath
$FolderACL.RemoveAccessRuleAll($objACE)
Set-Acl $FolderPath $FolderACL
$FolderACL.AddAccessRule($objACE)
Set-Acl $FolderPath $FolderACL
}
