I use
code:
	$Make =WMIQuery("Manufacturer","Win32_ComputerSystem")
	$Model=WMIQuery("Model","Win32_ComputerSystem")
	$SerNo=WMIQuery("SerialNumber","Win32_BIOS")
	if $SerNo < " " 	
		$SerNo=WMIQuery("SMBIOSAssetTag","Win32_SystemEnclosure")
		endif
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