virtualbox.org

When I installed the May 2020 Update for Windows from Microsoft, version 2004, I could no longer launch Virtualbox. It errored even before the virtual machine started.
The error had to do with Vt drivers not being available.

When I looked at the "Programs and Features" > "Turn Windows Features On or Off", it showed that "Windows Hypervisor Platform" is checked (turned on) as well as "Virtual Machine Platform".

If you experience this error, simply TURN OFF the Windows Hypervisor Platform and it should come up.

Thanks for your experience, and glad you're up and running.

I have a 64bit host, but can't install 64bit guests covers everything we know about how Hyper-V deep-sixes Virtualbox.