This command activates 'vboxmanage', a command-line program included with Virtualbox that allows you to edit the properties of your virtual machine, including its built-in resolutions. This command will change the focus of the Command Prompt to the program folder for Virtualbox (if you installed Virtualbox somewhere different, then change the command to wherever you installed it). You can do this by opening the Start Menu, and typing 'command prompt' into the Start Menu search bar. Then, type the following command into the Command Prompt.

To do this, open the Command Prompt in Windows (make sure you are logged into an Administrator account on Windows). If this is this case, you will have to trick Virtualbox into thinking that your processor is actually an older model.

if your computer was built/bought in 2013 or later). NOTE 2: Virtualbox may have problems booting Mac OS X if your computer uses an Intel Haswell processor (i.e. Type the boot flag 'amdfx' (also without quotation marks) if your AMD processor has 'FX' in its model name. NOTE 1: If your computer uses an AMD processor, you will have to type the boot flag 'amd' or 'amd64' (without quotation marks)- which flag you need depends on your specific processor, so test one flag at a time.

You will come up to the Niresh boot screen, with one option to select: OSX-Mavericks.

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