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Reset your Windows 10 local account password
Use the following instructions to reset your local account password. Your local account signs you in on your device offline, but it doesn't link to your other devices. For a more complete experience, we recommend you sign in with a Microsoft account to access services like Outlook, Skype, and OneDrive on any of your devices. If you forgot your Windows 10 password, the easiest way to get back into your account is to reset the password for  your Microsoft account
Reset local account password for Windows 10, version 1803 and beyond
If you added security questions when you set up your local account for Windows 10, then you have at least version 1803 and you can answer security questions to sign back in.
After you've entered an incorrect password:
  1. Select the  Reset password  link on the sign-in screen. If you use a PIN instead, see PIN sign-in issues . If you're using a work device that's on a network, you may not see an option to reset your password or PIN. In that case, contact your administrator.
  2. Answer your security questions.
  3. Enter a new password.
  4. Sign in as usual with the new password.
Reset local account password for Windows 10, before version 1803
For versions of Windows 10 earlier than 1803, local account passwords can't be reset because there are no security questions. You can reset your device to choose a new password, however this option will permanently delete your data, programs, and settings.  If you've  backed up your files you'll be able to  restore your deleted files . For more information, see Recovery options in Windows 10
To reset your device, which will delete data, programs, and settings:
  1. Press the Shift key while you select the Power   button > Restart in the lower-right corner of the screen. 
  2. On the  Choose an option  screen, select Troubleshoot > Reset this PC.
  3. Select Remove everything
Reset your Windows local account password - Microsoft Support
If you forgot your Windows 10 password, the easiest way to get back into your account is to reset the password for your Microsoft account. Reset local account password for Windows 10, version 1803 and beyond
Switch your Windows 10 device to a local account
Note: If you’re using Windows 10, version 1803, you can add security questions—instead of a hint—to your local account to help you reset your password in case you forget it. Check your version of Windows 10. Select Next, then select Sign out and finish. Sign back in with your new local account.
Windows sign-in options and account protection - Microsoft Support
Go to Sign-in options. Change or manage your password or PIN. To change your password or PIN, go to Start > Settings > Accounts > Sign-in options. Select PIN (Windows Hello), and then select Change PIN. Select Password then select Change.
Troubleshoot problems signing in to Windows - Microsoft Support
If you have a local account: If you’re using Windows 10, version 1803, and added security questions to your local account to help you reset your password, select Reset password on the sign-in screen. (This link appears after you enter an incorrect password.)
Create a local user or administrator account in Windows
With answers to your security questions, you can reset your Windows 10 local account password. Not sure which version you have? You can check your version. Create a local user account. Select Start > Settings > Accounts and then select Family & other users. (In some versions of Windows you'll see Other users.)