If using virt manager I would advise that you:
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create a folder called 'Storage' in your /home folder and point Virt Manager to save images there.
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copy the VBox image into 'Storage'.
When you run Virt Manager you will be asked for your /root password (I am using Devuan where I have created a separate /root user account to mine so I don't have raised privileges for security reasons).
Click on New Virtual Machine, then select Import existing image:
Back later as copying .vhd of 138 Gb going to take some time of Windows 7 Pro!
Job done! As soon as you click on finish it will launch the newly created image in Virt Manager!
I would advise that you need a machine with 8 Gb of Physical RAM and allocate half of that to the VM and 2 processors if you have a multiple processor like my Ryzen 7. The Desktop image quality is far better than Virtual Box but don't expect to use any VM software to play games on!