Get-WmiObject throws "Invalid access to memory location."

I'm trying to run the following PowerShell command under WinPE (Version 10.0.10586.0):

Get-WmiObject -Class Win32_ComputerSystem

But I get this error:

Get-WmiObject : Invalid access to memory location. (Exception from HRESULT: 0x800703E6) 
At line:1 char:1
+ Get-WmiObject -Class Win32_ComputerSystem
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-WmiObject], BadImageFormatException
    + FullyQualifiedErrorId : System.BadImageFormatException,Microsoft.PowerShell.Commands.GetWmiObjectCommand

Searching Google I only found that the WinPE-WMI.cab might be missing. But that isn't the case!

Any ideas?