Select the Start button, select Settings > Update & security > Activation , and then select Troubleshoot. You must be signed in as an administrator.The troubleshooter will show a message that Windows can’t be activated on your device. Select I changed hardware on this device recently, and then select Next.Enter your Microsoft account and password, and then select Sign in. You’ll also need to enter the password for your local account if the Microsoft account you entered isn’t a connected account.From the list of devices that are linked to your Microsoft account, select the device that you’re currently using, select the check box next to This is the device I’m using right now, and then select Activate.If you don’t see the device you’re using in the list of results, make sure that you’re signed in using the same Microsoft account you linked to the Windows 10 digital license on your device.
Does a slow PC have you down? If so, try some of the following suggestions to help make your Windows 10 PC run better. The tips are listed in order, so start with the first one, see if that fixes the problem, and then continue to the next one if it doesn't.