I discovered the cause. It was not due to any Windows updates. The issue was due to the installation of Dell Precision Optimizer Application I had installed today. I uninstalled this, and both Windows 7 and Windows 10 VMs start again.
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I discovered the cause. It was not due to any Windows updates. The issue was due to the installation of Dell Precision Optimizer Application I had installed today. I uninstalled this, and both Windows 7 and Windows 10 VMs start again.