I running on Ryzen 3600 with Windows 10 pro.
already enable virtualization in UEFI .
Can run normally in Nox (Android Emulator), Virtual Box.
But cannot run DockerToolbox with the same error message as you.
I can run Docker Desktop but it seem to be conflicted with Nox, VirtualBox because I have to enable Hyper-V in Windows Features but Nox, Virtualbox need to disable Hyper-V in Windows Feature.
Anyone can solve this problem? pleas help me.
UPDATE!!!:
Open PowerShell as Administrator then type following command:
docker-machine create default --virtualbox-no-vtx-check
after wait for a while I can start docker toolbox normally.