If you have Windows 8, you product key will activate by itself as soon as you connect to the internet. The product keys for Windows 8 are bound to the motherboard, making it much easier to upgrade
- Press Start and then click Settings
- Click Updates and Security
- Click Activation on the sidebar to the left
This next picture is for step 4 and 5.
Click Change product key
If you key doesn’t work, click troubleshoot.
If you’re in any luck, this hasn’t been patched yet and the troubleshoot menu will upgrade your Windows 7 key to Windows 10. After you upgrade it, you can restore your pc as many times as you want and it will still automatically activate like a standard Windows 10 key does.