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Since the recent Fall Creators Update I'm facing a strange behavior while using Windows 10. My brother and I are using different accounts, both protected by password. When I turn on my PC and sign in, an automatic startup program (the Blizzard Launcher) warns me that it can't start since another user on the same computer is using that app. I thought that it was impossible, my brother's account can't be active if I just turned my PC on.

Actually, if I press the start button and the user icon, it says that my brother is signed in.

Image for reference

Ok, he must have turned the PC off without properly disconnecting the account, I thought, right?

So I let my brother log in his account, sign out, turn the PC off, turn it on again, log in my account. Same problem, his account is already signed in. Without even entering the password.

The same happens if he is the one to login first after booting, he sees me already signed in. If I switch account to mine, I can clearly see that my startup programs are already started and ready.

How is this possible? Windows is booting up accounts without even putting the password in?

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  • The screenshot is not mine, I just took it from the web to better explain how I can tell for sure that my bro's account is already signed in
    – Oneiros
    Commented Oct 25, 2017 at 18:36
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    If you revert back to 1703 does the behavior continue to happen?
    – Ramhound
    Commented Oct 25, 2017 at 18:36
  • I wanted to be sure that this is a bug of the recent update before doing that, maybe it is some weird setting I didn't know about?
    – Oneiros
    Commented Oct 25, 2017 at 18:38
  • I was unable to reproduce the behavior on my 1709 VM. I even created two users and enabled the built-in Administrator.
    – Ramhound
    Commented Oct 25, 2017 at 19:59
  • When you "turn it off", do you have hybrid shutdown (Fast Startup) enabled? Turn that off, if so, and try a full shutdown (e.g. shutdown /s /t 0). See lifehacker.com/…
    – DrMoishe Pippik
    Commented Oct 25, 2017 at 23:47

3 Answers 3

Reset to default
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Open Settings, Accounts, Sign-in Options.

Sign-in Options

Disable Use my sign-in info to automatically finish setting up my device after an update or restart

Hope that helps. Let's know.

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    This can also be controlled by the DisableAutomaticRestartSignOn reg key in HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System. If you set it to 1, the option in Control Panel will no longer be visible.
    – Sunil Patel
    Commented Mar 19, 2018 at 9:51
  • This didn't work for me. I can still boot up my PC and see that other users are logged in, even though they shut down the PC
    – Shiraz
    Commented Mar 12, 2019 at 21:47
  • This worked, although it doesn't really make sense. I was seeing the problem doing several logins, logouts, and restarts in a short period. Windows 10 isn't doing updates every minute, so why is it auto signing in users on every single restart?
    – pacoverflow
    Commented Aug 12, 2019 at 18:52
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    Typical Microsoft approach to security, just log people in without authentication. What could possibly go wrong?
    – Sam Watkins
    Commented Aug 23, 2020 at 5:23
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    @SamWatkins I am certainly not disagreeing with you, just adding a few details from Microsoft: “After the final Windows Update reboot, the user will automatically be logged in via the Autologon mechanism, and the user's session is rehydrated with the persisted secrets. Additionally, the device is locked to protect the user's session. (…) Upon a successful ARSO configuration and login, the saved credentials are immediately deleted from disk.” docs.microsoft.com/en-us/windows-server/identity/ad-ds/manage/…
    – Melebius
    Commented Aug 9, 2021 at 9:21
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You may also need to change the settings that turn shutting off into hibernate. Windows 10 will go to hibernation instead of shutdown even if you disabled it and asked to shutdown.

You can reach that setting by;

  1. Go to Windows 10 Control Panel.
  2. Go to the Hardware and Sound.
  3. Go to Power Options.
  4. Click "Choose what the power button does" on the left panel.
  5. Click "Change settings that are currently unavailable" and type in the Admin password
  6. Uncheck "Turn on fast startup (recommended)"

Image provided by Shiraz

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  • I think this is the screen you're referring to:imgur.com/tv1FTD9
    – Shiraz
    Commented Mar 12, 2019 at 21:59
  • Fast boot is a different thing, unrelated to the automatic user logins. Also, there are no such items in Control Panel, did you translate the names from another language?
    – David Balažic
    Commented Aug 25, 2020 at 8:50
  • Yes, I translated from French.
    – pierrebai
    Commented Aug 27, 2020 at 15:17
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The account which got logged in automatically on my machine did not have any password set up.

I tried the solution using Settings and by editing the registry without success.

The solution for me was to enable password login for that account. For details, see solution #1 on https://www.reneelab.com/windows-10-disable-auto-login.html.

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