Problem handling “Unable to active Windows”

During activation, the system prompts:

We can’t active Windows on this device because the product key was already used on another device. If you think it was’t used on another device, select Troubleshoot below. ( 0xc004c008 )

Learn more about Windows Activation

You can also activate this device by going to the Store and purchasing a genuine copy of Windows.

The solution

1. Press the keyboard Win + R
2. Input “slui 4”, and choose your country
3. Send us the number of 9 group ( installation ID )

After we get your ID, we will send you another confirmation ID, and you enter the confirmation ID.