We have observed that when attempting to run a VirtualBox image in Oracle VirtualBox, an error appears stating that VirtualBox is not signed with a build certificate ...

VirtualBox is my go-to virtual machine technology. Not only is it free to use, but it’s also very powerful and makes it easy to create VMs for all types of hosts — from Linux, macOS, Windows and more.

It is the very first troubleshooting suggestion you should follow in order to get rid of this problem from your Windows computer. Third-party virtual machine apps, such as VirtualBox, VMware ...