After reboot my desktop was weird like half win10 and 7.
If the WX install finished then the key is now a Windows 10 key.
Does not work on Windows 8 and above because it was designed for 7 and the storage system has changed... worse it can give incorrect keys.
luckily I revert back to 7
What software did you use to do this... a 3rd party app like Acronis will work but the default Microsoft product is shit.
Assuming your old W7 copy was legal then the new WX copy is as well... I'd remove all your hdds/ insert a new blank hdd and install a fresh WX on that, home or pro as before, then skip the "ask for a key screen" until you get to the desktop. Your only other LEGAL option is to find the old W7 key for that...