VirtualBox fails to load VM with code E_FAIL (0x80004005)

I’m using the latest version of VirtualBox 6.0.4 r128413 (Qt5.6.2) trunning on x64 Windows 10. Had been running a Windows XP guest for this morning, then shut it down. After an unrelated update to a Visual Studio installation, the VM now will not start with the following error:

Failed to open a session for the virtual machine WindowsXP.

The virtual machine 'WindowsXP' has terminated unexpectedly during startup with exit code -1073741819 (0xc0000005).  More details may be available in 'H:\VMs\WindowsXP-Dev\WindowsXP\Logs\VBoxHardening.log'.

Result Code: E_FAIL (0x80004005)
Component: MachineWrap
Interface: IMachine {5047460a-265d-4538-b23e-ddba5fb84976}

The VBoxHardening.log is incomprehensible, but I do note this question has a similar problem, though with a much older version of VB.

What is going on? How do I force VB to abandon the check for DLL versions?

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