That class won't give you that information. Try this:

 Code:
For each $Element in $Branch
   $objWMIService = GetObject("winmgmts:\\" + $Element + "\root\cimv2")
   $colItems = $objWMIService.ExecQuery("Select * from Win32_ComputerSystem",,48)
   For each $objItem in $colItems
     "PC Name: " + $objItem.Name ?
     "UserName: " + $objItem.UserName ?
     ?
   Next
Next


Edited by eriqjaffe (2009-08-04 06:49 PM)