How to use Hyper-V and Virtualbox simultaneously on the same computer

Its easy:

Open command prompt as administrator and type:

bcdedit /copy {current} /d "Windows 10 (com Hyper-V)"

This will make you create new entry in bcd database, identical to current one.
Next type this:

bcdedit /set {current} hypervisorlaunchtype off

This will make you set the current entry to disable hyper v.
Now you have a menu that will prompt when you login.

At last, but not least:

bcdedit /timeout 3

This is the time menu will be showing.

Thats it!