Windows will think it’s running on a real computer, but it’s actually running inside a piece of software on your Mac. They allow you to install Windows and other operating systems in a window on your Mac desktop. Virtual Machines A virtual machine is one of the best ways to run Windows desktop software. Microsoft Virtual PC is a free virtualization tool of Microsoft that allows you to simultaneously execute various operating systems on the same computer. How do I get back to my Mac from Virtual PC?.What can I do with VirtualBox on my Mac?.Can you download Microsoft Virtual PC for Mac?.