How to Fix Windows 10 Activation Error 0xC004C008

How to Fix Windows 10 Activation Error 0xC004C008

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How to Fix Windows 10 Activation Error 0xC004C008

Are you receiving Windows 10 Activation Error 0xC004C008? Are you not able to activate Windows 10 on your brand new PC? Do not worry, today in this post I will provide a few simple steps to fix Windows Activation Error 0xC004C008. Let’s start with a real-life scenario:

Can’t Activate Windows 10 0xC004C008, I’m not able to activate Windows. I have a legitimate key associated with my Lenovo notebook. I suspect that the issue is that once I activated on a virtual machine on Ubuntu, but now that virtual machine is gone and I’m running a proper installation on Windows and need to activate it. What number can I call to or how can we solve this? I need the association to that VM that doesn’t exist anymore removed and being able to activate it on this proper installation.

Source: Microsoft Community

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Like the above user, there are many Windows 10 users who are not able to activate Windows 10 due to an error “We can’t activate Windows on this device because product key was already used on another device”. Error code: 0xC004C008. Please perform the steps provided below to learn how to fix Windows 10 activation error 0xC004C008.

Note: Make sure you are not using the same Windows 10 product key on more than one computer. A single product key is meant to be used on a single PC. You cannot use it on multiple systems, if you are sure that you are using the product key on a single system then please perform the steps provided below:

Use Windows Activation Troubleshooter

Open Windows 10 Settings by pressing Windows + I key on the keyboard. You can also go to the Windows Start button and click on the Settings icon.

On the Windows Settings screen, click on Update & Security


Select Activation option on the left-hand side of the screen and then click on Troubleshoot

Activation troubleshooter

This will identify the issue and activate the Windows 10 on your computer. If this does not help move on to the next step.

Use Microsoft Phone Activation

Press Windows + R key on the keyboard to open the Run box. or simply type run on the windows search box on the bottom left of your screen. In the Run box, type SLUI 4 and click on OK as shown below:


Select your country and click Next


On the next screen, you will find the Toll-free number to call Microsoft. Use the Toll-free number provided and follow the automated phone instructions, when asked for Installation ID,  provide the 63-digit Installation ID on the phone.


After dialing the installation ID on the phone, click on Enter the Confirmation ID. Now enter the confirmation ID provided by phone activating system and then click Activate Windows as shown below:


This should activate the Windows 10 on your PC.

Contact Microsoft

In case both the step does not work then contacting Microsoft support will be a good idea. They have their own ways and advanced tools to activate Windows. If you have a genuine unused copy of Windows 10, they will definitely help you out.

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I hope by using the Windows Activation Troubleshooter and Phone activation you should be able to fix Windows 10 activation error 0xC004C008. Please contact Microsoft in case the error 0xC004C008 still persists.

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