Install Portable VirtualBox to an External Drive First, get started by downloading the Portable VirtualBox installer from vbox.me . Run the downloaded file and extract it to an external drive or wherever else you want to store your portable VirtualBox system. You can always move it later, if you like. Launch the Portable-VirtualBox.exe program from here and you’ll be prompted to download and install VirtualBox’s program files on your external drive. The tool can automatically download VirtualBox’s files for you. After it does, click the OK button to unpack them. If the full version of VirtualBox is already installed on your computer, you won’t see this screen and VirtualBox will just open instead. You’ll want to uninstall VirtualBox first or set this up on a computer without VirtualBox installed. Launch the program again after it finishes unpacking files. After you agree to a UAC prompt , you’ll see the standard VirtualBox window. A VirtualBox system tray icon...