How do I import & use files in Virtualbox?

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http://askubuntu.com – I created a Virtualbox migration of freshly installed XP SP3 using the free Paragon Go Virtual program from within windows. It's 2 files are on a USB stick. I've tried importing/opening from there as well as after copying them into the /home/Virtualbox VMs/ folder with the same result. I've opened Virtualbox and tried every variation of every menu I could find as well as trying to find the precise steps for importing/opening & running this in it's help, but it fails each time with an error message. Failed to import appliance (path)/x.ovf Storage for the medium (path)/vdisk0.vmdk is not (HowTos)