The problem is that Name is what the class, Win32_ComputerSystem, is indexed by. Index may not be the best way to describe it, but you have to know one of the values of a keyed attribute to get a attribute of a particular instance. You can use the WMI CIM Studio to see which attributes have the key next to it.
Here is an example getting the Computer's name from another class. Code:
? "BusSystemName= " GetObject("winmgmts:\\" + $strComputer + "\root\cimv2").InstancesOf(Win32_Bus).Item("Win32_Bus='PCI_BUS_0'").SystemName
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Kelly
