The error message code 0xC004C003 is a Activation error that says the server determined the keys to be invalid or keys are blocked. It often comes up when Windows 10 users try and activate their operating system after a clean install. It happens when the product key that you enters doesn’t work and therefore Windows couldn’t be activated. If you are among unlucky users who encounter this error, don’t worry because we have the fix.

Following are two methods that can help you fix activation error 0xC004C003 in Windows 10. It’s very easy to do. Let’s check out now!

Method 1: 

Sometimes, resetting your computer can help you solve this issue. Here are the steps:

Note: This method doesn’t always work but it’s worth the try. Remember to take a backup for any of your important files before performing the following steps.

Step 1: Tap on the Start button and choose Settings

Step 2: Tap on Update and Security

Step 3: Head to Recovery that is located on the left pane

Step 4: Now you see the Reset this PC option. Click on Get Started.

Step 5: Wait until everything is over and see the error code 0xC004C003 Product key blocked in Windows 10 should be fixed.

Method 2:

There is another way for Windows 10 users to request manually for activation. Here are the steps:

Step 1: Head to the Command Prompt and run it as administrator

In Windows 10, you go to the Command Prompt and run it as administrator.

Step 2: Type slmgr.vbs /ato and hit enter

Step 3: Wait for the Windows Script Host to activate the OS and show the activation status

Note: Some users report that it doesn’t work for the first time but after several attempts, their Windows installation was activated successfully. 

That’s it! If you have another solution to this problem, please share it in the comments below.


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