Windows 10 won't activate after a hardware change? If so, use this guide to fix this problem.
On Windows 10, when you make a significant change, such as replacing the motherboard, hard drive, or processor, the system may fail to recognize the computer. As a result, the installation will become deactivated (with error 0xC004F211).
In older versions, if Windows lost its activation because of a hardware change, you needed to go through the tedious process of contacting Microsoft support to reactivate, which is not an ideal solution, and no many users were aware of the option.
Full story from the WindowsCentral blog...