Will my old product key work on windows 10

[braverhydra]

Hi, I am working on a computer for my sister, but I am using only school parts, as my school believed it did not work, but when I used it it worked fine. Anyway, my parents current PC is running windows 10 but has a windows 7 product key on the side of it. Their PC is still in use, so if I copy that product key off that PC, and use it to activate the school computer, which I just loaded up with windows 10, would it work.

 

[R_1]

pretty sure the key was invalidated when it was upgraded to windows 10.

you can run windows un-activated for a period. you do not need the key to install.
there is always free OS like linux
linux mint with cinnamon is my fav
https://linuxmint.com/

 

[Zatanus]

Yep. No problem.
Windows 7 key still work. At any moment, in the install process or later with the activate option. In the last 6 months I done more than 30 installations for customers and works flawlessly. Sometimes with 1703 show error of invalid key in the activate procedure in the "This PC" properties option. Troubleshooting solves most of the cases. 1709 and 1803 works fine. In the install with USB normal way, works always. Even putting a Pro Win7 key on a Windows 10 Home converts that config in Pro.

I used keys from old laptops to desktops, keys that never before has used to upgrade. Some keys from dead old computers also. No problems.

 

[USAFRet]

Hi, I am working on a computer for my sister, but I am using only school parts, as my school believed it did not work, but when I used it it worked fine. Anyway, my parents current PC is running windows 10 but has a windows 7 product key on the side of it. Their PC is still in use, so if I copy that product key off that PC, and use it to activate the school computer, which I just loaded up with windows 10, would it work.

An OEM Win 7, that was upgraded to Win 10?
No, that won't work on some other system.

 

[JeffDaemon]

OEM keys will not be transferable as windows will do a bios check to see if the machine series matches the key. Purchased keys however are still yours and you own it. When you upgraded one pc to windows 10 you were given an all new digital key based on your ownership of a legit windows 7 key. You are still free to install that windows 7 key elsewhere. You could net several windows 10 upgrades this way but then again, there was very low security checking in the whole windows 10 process.