A couple of months ago I made a barebone backup of my Windows 8 installation (OS, drivers, updates and activation), at that time I restored it as well to make sure it worked. Today I restructured the hard drive to repurpose one of its partitions and since the layout changed after restoring the image I'm unable to boot the system. It gets me to a blue screen where I can either try again or press F8 to get to the advanced options (but it gets me to the same screen). The problem is I don't recall having made a copy or written down the key for that so even if I wanted to install Windows from scratch I wouldn't be able to start go through the key entering stage. Is it possible to extract a product key out of a WIM backup? If so, how could I do it? It was a retail key, and the backup was done via a WinPE with dism.