0xc004c003 error and problems activating Windows 10? Microsoft has a workaround
To get the most out of Windows 10, and to avoid being pestered by constant reminders, you need to activate it. This is not always the smooth, trouble-free process it should be, and people often run into problems.
If you have installed the KB4598291 update for Windows 10, you may well have been plagued by activation failure with a 0xc004c003 error. Now Microsoft has provided details of what is going wrong, as well as revealing a workaround.