How To Fix Windows 10 Activation Error Code 0xC004c003

This tutorial will walk you through the steps of how to resolve the following error alert:

“This product key doesn’t work. You might need to get in touch with the store or company you bought Windows from, or you can buy a new key from Microsoft.

When upgrading to Windows 10, you might see a message that says “This product key didn’t work. (Error code: 0xC004C003).”