This video teaches you how to fix Error code 0XC004C003 while trying to activate your Windows 10.
Important info: this guide mainly applies to Windows 7 Similar errors are: 0xC004C060, 0xC004C4A2, 0xC004C4A2, 0x803FA067L, 0xC004C001, 0xC004C004, 0xC004F004, 0xC004C007, 0xC004F005, 0xC004C00F, 0xC004C010, 0xC004C00E, 0xC004C4A4, 0xC004C4A5, 0xC004B001, 0xC004F010, 0xC004F050 Before you get started, make sure the key you entered is correct. Step 1: You may have to wait awhile, as Microsoft Product Activation Server could have become overloaded. Step 2: Update your operating system Step 3: Try Activation troubleshooter Settings > Update & security > Activation, and then select Troubleshoot. You must be an administrator to use this option.