T450s Create VM from Recovery Partition?

[scottkeen]

I have a T450s which shipped with Windows 7 Professional.

I recently upgraded to Windows 10.

I need do some testing in Windows 7 and would like to run it in a VirtualBox VM.

How can I "recover" the factory Windows 7 Pro from the T450s Recovery Partition to a VM? I opened the recovery partition (drive Q:) and it shows up as empty but Windows explorer says there's "4.77 GB free of 15.4 GB" which sounds to me like there's 10+ GB of installation files.