Hello! I have two different computers, both with Windows 10 Pro installed. One was upgraded from a retail upgrade version of windows 8.1 and the other one was upgraded from an OEM Windows 7 license. Now I need to swap the main harddrives between these two computers and I'm not sure if I can do that without having activation problems with Windows. Has anyone here done something like this? I'm guessing since both machines are activated and has a licensed tied to the hardware, they should both be able to activate after changing the harddrives. But I'm not really sure. It would be nice of course if I can keep the installed windows with programs and everything on each computer after swapping the harddrives, but I'm guessing that Windows might not want to run properly when the installation is booted on different hardware, so I'm prepared that I might need to reinstall both machines anyway. Do I need to deactivate and/or uninstall the product key somehow before changing the harddrives? Since the product key installed on harddrive A is tied to computer A and the harddrive will now be moved to computer B, and vice versa. Not sure if I'm making any sense at all here, but I would be very happy if anyone has any ideas on how to make this switch as smooth as possible. Thanks in advance!