For these users, everything went perfectly fine during the install process, their computers didn’t remain stuck in reboot loops, and everything seemed to be working as it should. Unfortunately, when they try to log in after the final reboot, the system doesn’t recognize their passwords. Some users have been able to log in using their Microsoft Account, but when they try to change the PIN, they usually receive an ambiguous message informing them that PIN is being changed in the background, and they will be notified when the new PIN is available. Apparently, the PIN change demand isn’t taken into account, despite the confirmation message displayed on the screen.
Users can’t log in to their computers after upgrading to Windows 10 version 1607
How to fix log in issues in the Anniversary Update
1.Boot from Windows 10 bootable CD/DVD or USB. If you don’t have one, use the ISO file to prepare one. 2. When the install screen appears, go to Repair your computer > Advanced Options >Troubleshoot > Command Prompt. 3.Type net user administrator /active:yes to activate a hidden administrator account. 4. Close command prompt and remove the installation media. Restart your computer and log in. No password is required for hidden admin accounts. If this quick fix doesn’t work for you, you should reinstall Windows on your computer. RELATED STORIES YOU NEED TO CHECK OUT:
Fix Windows 10 Anniversary Update stuck in reboot Anniversary Update crashes Surface Pro 3, Surface Pro 4 devices Fix 0xa0000400 error during Windows 10 Anniversary Update install
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