Double click the OVA file to open it in VirtualBox or whatever virtualization software you have installed. If you have more than one (for example both Oracle VirtualBox and VMWare Player), the OVA file will open ion which ever is your default virtualization software. In this case if you want to use one in particular, then right mouse click the OVA file and select the one you want to use. The OVA file should work with any current virtualization software, though MSB Computer Services recommends the use of VirtualBox, and the instructions that follow are specific to VirtualBox.