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Home » Steps to Fix Windows 10/11 Activation Error 0xc004B100

Steps to Fix Windows 10/11 Activation Error 0xc004B100

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  • Are you unable to activate your Windows 10/11 using the Activation Key?
  • Is error code 0xc004B100 popping up during Windows Activation?
  • Do you want to resolve the Windows Activation Error 0xc004B100?

The error code 0xC004B100 typically arises when users of Windows 10 or 11 attempt to activate their Windows version using the license key. Even if the license key is accurate, Windows may reject it, preventing activation and triggering the aforementioned error.

Error Message:

0xC004B100, The activation server determined that the computer could not be activated

In this tutorial, we will explain why Windows rejects the activation key and guide you on resolving it independently.


There isn’t a singular specific reason that causes this error, but several common factors may contribute to its occurrence. Some of these are outlined below:

  1. Unstable Internet Connection.
  2. Invalid or Expire Product Key.
  3. The motherboard has been changed or replaced.
  4. Some important system files are missing or damaged.
  5. Bad entries in the Registry file, etc.

These are the most common factors that can lead to the Windows activation error. However, there’s no need to panic because below, you’ll find a set of troubleshooting steps that can assist you in resolving Windows activation issues.

Method 1: Fix using the Outbyte PC Repair Tool

Most Windows activation errors often stem from misconfigurations in the Windows operating system, including missing or corrupted system files, invalid entries in registry files, outdated drivers, outdated software, and Windows itself, as well as malware or virus infections.

Consider using the Outbyte PC Repair Tool to address and repair these Windows issues, restoring the overall health of your operating system.

3 Steps to Fix this Error
Step 1. Download Outbyte PC Repair Tool [File Size: 16.4 MB]
Step 2. SCAN your Windows PC
Step 3. Click Fix button to Repair Error

Method 2: Check the Internet connection

For a successful Windows activation, a stable internet connection is essential. If you are behind a proxy or VPN, attempt to connect directly to the internet before entering activation keys to avoid encountering error 0xC004B100.

To Disable Proxy:

Steps to Disable Proxy

Step 1: Open Settings → Network & Internet → Proxy

Step 2: Turn off the ‘Automatically detect settings‘ and then click on the ‘Set up‘ button inside ‘Use a proxy server‘.

Step 3: Turn off the ‘Use a proxy server‘ and then click on the Save button.

To Disable VPN:

Steps to Disable VPN

Step 1: Open Settings → Network & Internet → VPN.

Step 2: Click on the ‘Disconnect‘ button to turn off VPN.

After stabilizing the internet connectivity and disabling the proxy and VPN, proceed to perform the Windows activation once again.

Method 3: Use Windows Activation Troubleshooter

Windows includes a built-in Activation Troubleshooter designed to address activation-related issues. Utilizing the Windows Activation Troubleshooter can effectively resolve the activation error 0xC004B100. Here’s a guide on how to use this troubleshooter:

Get Help - Activation Troubleshooter

Step 1: Open Settings → System → Activation.

Step 2: Click on the Get Help link.

Step 3: Scroll down and click ‘Yes‘ to provide your consent.

Step 4: Follow the wizard by selecting the appropriate answers, and initiating an automated process to rectify your activation problem.

Method 4: Activate Windows using Phone.

If online activation is unsuccessful, and the error code 0xC004B100 persists, you have the option to activate Windows using your phone. Follow these steps to perform this method:

Activate Windows using Phone

Step 1: Open the Run dialog box, type ‘slui.exe 4‘ and press Enter.

Step 2: Select your Country and click Next.

Step 3: In this step, locate the provided phone number and make the call. Share the Installation ID during the call, and the support team will furnish you with a Confirmation ID. Input this Confirmation ID into the designated field by clicking on the ‘Enter Confirmation ID‘ button.

Step 4: In this way, you can activate Windows using the phone.


To resolve the Windows Activation error 0xC004B100, follow the troubleshooting steps outlined in this article. Various methods can be employed to address this issue, including stabilizing your internet connection, disabling proxy and VPN, utilizing the troubleshooter, and activating Windows through your phone.