Vista - Hyper-V Startup Script Not Working

I am trying to use the following vbscript to start a Win2K3 guest on a
Hyper-V server running on Win2k8. The shutdown script runs fine, but when I
run this script to startup the same VM, I get the error:

Microsoft VBScript runtime error: Object doesn't support this property or
method: 'ItemIndex'

I got this code from the Virtual PC guy's blog, and I've seen reference to
it in many places. Can you tell me why this is not working? I am running
the script from my backup server, which is Win2K3.

Thanks,
Joe

Code Snippet:
Dim VMList
Dim VMName
Dim VMGuid
Dim ShutdownList
Dim Result

'Specify the name of the virtual machine that I want to shutdown
VMName = "PrinterVM"

'Get instance of 'virtualization' WMI service on the local computer
Set WMIService = GetObject("winmgmts:\\printserver\root\virtualization")

'Query for the specific virtual machine that I want to shutdown
Set VMList = WMIService.ExecQuery("SELECT * FROM Msvm_ComputerSystem WHERE
ElementName='" & VMName & "'")

'Get the GUID for the virtual machine I want to shutdown
'VMGuid = VMList.ItemIndex(0).Name

'Query for the MSVM_ShutdownComponent that corresponds to the VM GUID that I
have
'Set ShutdownList = WMIService.ExecQuery("SELECT * FROM
Msvm_ShutdownComponent WHERE SystemName='" & VMGuid & "'")

' Request a state change on the first VM that is returned
' 2 = start, 3 = stop and 32769 = save state
VMList.ItemIndex(0).RequestStateChange(2)