Things you should know:
- A Windows 7 or Windows 8/8.1 product key cannot activate Windows 10. Windows 10 uses its own unique product key.
- By default, Windows 10 builds are pre-keyed, meaning, you do not have to enter a product key and should not be prompted to enter one as long as you upgraded from an activated Windows 7 or Windows 8 or Windows 8.1 license or Windows 10 Preview build.
- If you perform a clean install on first attempt, you will have to start over from an activated Windows 7 or Windows 8/8.1 installation.
- If you are prompted to enter a product key, click Do this later and give it a few days, Windows 10 will activate automatically.
- Activation servers are being overwhelmed at the moment because of the volume of upgrades, so give it some time if you get an error message such as (0XC004E003, ,0x8007000D, 0x8007232b or 0x8007007B) Windows 10 will eventually activate as long as you upgrade using the appropriate method.
- There is no need to know your Windows 10 product key, read the following ‘Understanding Product Activation in Windows 10
- “Windows 10 handles keys differently. When you upgrade to Windows 10 via Windows Update from Windows 8.1 or Windows 7, the process registers your computers hardware, and qualifying OS with a Microsoft Product Activation Server. The device is then considered a Windows 10 device.
- Subsequently anytime you re-install (or clean install) the installation checks with those servers, finds the unique installation ID and produces the validation”