An example of a script that gets the info you want.
Work great on my Dell laptop.

 Code:
$wmiColl1 = GetObject("WinMgmts:root/cimv2").ExecQuery("Select * FROM Win32_ComputerSystem ")
$wmiColl2 = GetObject("WinMgmts:root/cimv2").ExecQuery("Select * FROM Win32_BIOS ")

For Each $wmiObj in $wmiColl1
	? "Manufacturer: " $wmiObj.Manufacturer
	? "Model: " $wmiObj.Model
	? "Currently logged on user: " $wmiObj.UserName
Next

For Each $wmiObj in $wmiColl2
	? "Service tag:" Trim($wmiObj.SerialNumber)
Next

Sleep 3
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