So, in preparation to sell my old computer, I used the windows media creation tool and made a bootable usb, and used that to do a fresh install of windows on the computer. However, previously windows 10 had been running on my SSD. I took it out, and installed in on the HDD. Everything went well, except that now that I've sold it, it's telling the guy that his windows copy needs to be activated. Since it is the same mobo, I thought it would automatically activate once it connected to the internet? I'm not currently using the old SSD, is there anything I need to do with that to fix it? Also, the license is OEM, and one that was a free upgrade from windows 8.1 to 10.