Fall Creator's update on windows 10 keeps user from logging in - immediately sends user to lock screen and can't get past it.

this is the 2nd time this happened.  user on a standalone windows 10 PC applies updates with account 'user'.  After reboot, enters password on login screen. Screen flashes and goes to lock screen.  Trying to log in from lock screen again loops you back to lock screen.

If we log in with 'admin' account (a rarely used account), we get a welcome .... fall creator's edition.... a page with some choices about yes ./ no to personalized ad and things work OK for that user.

(seems the account that was the one that installed the update is the one that gets gummed up / locked).

What I did last time (3 weeks ago?) was created a 3rd account. logged into that account and then restored / rolled back / uninstalled receent updates.  then in that 3rd account, reapplied patches, etc and things were OK for that and the user account was fine.

Now weeks later,m user gets message about wanting to apply uipdates, reboots (when logged in as the 'user' account) and again, is locked out.

I guess I can roll back the updates etc.  but it's a pain.

any thoughts on why the account gets locked? (when logging in as user fails, we log in with admin and it shows that user is logged in (the user login was successful but then immedialtely locks before it gets to that ad settings page...)
BeGentleWithMe-INeedHelpAsked:
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Hello ThereSystem AdministratorCommented:
Navigate to the following location in registry:
HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
 
Change these two values to
Shell=explorer.exe
Userinit = userinit.exe
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Hello ThereSystem AdministratorCommented:
McKnife comment from similar thread:
Symptoms point to drive letters being mixed up. Cure is to delete hklm\system\mounteddevices from a setup disk. Can add more tomorrow.
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BeGentleWithMe-INeedHelpAuthor Commented:
hello- thanks, yeah, that's my first thread you reference : )

the fact that other users CAN login make me feel that an HKLM key isn't the issue (it would affect all users?)
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DonNetwork AdministratorCommented:
I'm inclined to think that it's related to the following setting

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

https://support.microsoft.com/en-us/help/4027599/windows-10-automatically-finish-setting-up-pc-after-update-restart

Try turning that off
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BeGentleWithMe-INeedHelpAuthor Commented:
THANKS for helping and not to say you guys were wrong, but this solved it for me:

https://answers.microsoft.com/en-us/windows/forum/windows_10-hello/windows-lock-screen-after-login/5a61ae57-9edb-40e4-8cae-e6aea68930c9

I went to Settings > Accounts > Family and other people > Set up assigned access and inexplicably found my mother's administrator account set up with assigned access and no application. I removed my mother's account from assigned access. I was prompted to log my mother's account out and I did that. I was then able to log into my mother's account without it immediately locking the screen. It took me hours to get to this point where I just stumbled onto this.

I have no clue what assigned access is, but the user account was in there, I took it out and then could log in fine...
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