Running Windows 10 as a virtual machine (VM) on VirtualBox is a smart choice if security is a concern. In the Host Only mode, you may disconnect the internet connection or create a virtual network adapter for a VM to enable network communication only between the host and guest systems and prevent the Windows 10 guest from connecting to other networks, including the internet. As you may recall, VirtualBox is installed on the host OS, which runs on a real machine, and the guest OS, which runs on a virtual machine.