


If your system shipped with recovery media like a DVD that contains the operating system, pre-installed software and the necessary drivers, you can use that to recover your system. However, there are still ways to get back to the version of Windows prior to your Windows 10 install.

Once you remove your previous Windows installation files, you won't be able to recover your system to the point just prior to your upgrade to Windows 10. In my case, that amounted to 16.7GB that I was able to reclaim, but this will vary from system to system.
