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#110
That error message is really misleading, it usually means that Hypervisor is turned on, and therefore VMware and VirtualBox virtual machines cannot run.
Easy to check: run bcdedit in elevated Command Prompt to show boot entries, check if current OS has hypervisorlaunchtype turned on (Auto). If yes, just turn it off and restart.
See Part One in following tutorial: Run Hyper-V, VirtualBox and VMware on same Computer
Kari