You may need to disable the hypervisor.
So, follow the next steps:
1) Open command prompt as Administrator
2) Run bcdedit to check hypervisor status:
bcdedit
3) Check hypervisor launch type:
![image showing command output with 'hypervisorlaunchtype Auto' marked](https://i.stack.imgur.com/TTL5f.png)
4) If is set to auto then disable it:
bcdedit /set hypervisorlaunchtype off
5) Reboot host machine and launch VirtualBox again
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