Windows Activation

Yesterday, we reported that Windows 10 is experiencing activation issues on multiple systems. It’s not known how many users were impacted by this bug and while several reports have surfaced online over the past few hours, it appears that Microsoft has already deployed the fix.

The error in the question looks like the below message:

“We can’t activate Windows on this device because you don’t have a valid digital license or product key. If you think you do have a valid license or key, select Troubleshoot below. Error code: 0xC004C003.

How to fix error 0xC004C003 and reactivate Windows 10

Microsoft has provided very little details on what exactly happened and what caused the problems but it appears to be a server glitch that has already been fixed.

If you’re still experiencing the problems, simply fix the activation error by following the below steps:

  • Open the Settings page from the Start menu.
  • In the Settings app,¬†Navigate to Update & Security > Activation and click the troubleshooter option.

Windows will connect to the servers, reverify the license and your Windows 10 device will be reactivated. There is no need to reset or contact Microsoft if this doesn’t work. The fix is rolling out and everything will return back to normal in few hours even if you don’t manually click on troubleshooter link.

  • Nick Kovalsky

    Many thanks, that solution wasn’t working yesterday, today this really fixed it :)

  • It’s not fixed for some. I didn’t initially experience this issue, and therefore wasn’t even aware of it, until well into the weekend. On Saturday I made several hardware upgrades – including both Motherboard and CPU. Upon booting after the upgrades, all seemed fine; I used my Microsoft account PIN to log in, it asked me to validate Windows, which I did, and all seemed to work. However, at some point overnight my Windows decided it wasn’t valid any more, to my surprise. I attempted to re-validate it on Sunday to no avail; I tried the Troubleshooter, which wasn’t able to resolve the validation, so I selected the “Changed Hardware” option and it failed with the statement that it doesn’t match any version on my account (despite checking my account and seeing it’s still listed there). I tried using CMD prompt method to check my system info and it reports that my Key is “Blocked”, whatever that means.I had used the free upgrade from Win 7 to Win 10 Pro years ago, when it was offered, so I don’t even know if I have my original Win 7 disk anywhere (since it was installed well over 10yrs ago). I haven’t been able to get through to MS Tech support yet, but everything I read online said to “Be Patient” but that the problem has been officially resolved. Sorry, obviously it hasn’t resolved for everyone, several days later.