Oracle VM VirtualBox is the most advanced free desktop-based virtualization utility and the most advanced open-source version virtualization software, too. It's not the best or easiest to use ...

VirtualBox is great for testing out a new operating system, but your virtual machines probably aren't that special when you first set them up. Here are a few tips for making them much easier to ...

You can install the new Windows 8 beta in a virtual environment using the free Oracle VirtualBox or VMWare Player. Here's how. Lance Whitney is a freelance technology ...

It is the first thing you need to fix the issue as stated above. For that, you need to run the virtual machine showing the error and go to the Devices > Install Guest ...