How to fix my windows hello login, which says "couldn't turn on the camera"?

Hi Ray. I'm Greg, a volunteer installation specialist and 8 year Windows MVP, here to help you.

You can roll back Fall Creators Update Version 1709 to the older version until it matures: http://www.thewindowsclub.com/rollback-uninstal...

Then hide the Update using the Hide Update Tool so it doesn't try to force itself: https://support.microsoft.com/en-us/kb/3073930

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If you want to try to repair Hello first try these steps which are working for some after Fall Creators Update:

1. Reset Facial Recognition and/or Fingerprint Options

Press Windows key + I to open Settings.
Click Accounts and select Sign-In options.
Locate Fingerprint or Facial Recognition options and click Remove under them.
After that, click Get Started and follow the on-screen instructions to reset Fingerprint and Facial Recognition.
Reboot your PC if needed.

2. Modify Group Policy Settings

Creators Update might have modified some of the crucial settings of Group Policy. Therefore, we would recommend to launch the Group Policy Editor and check/edit the settings related to Windows Hello functionality.

Pres Windows key, type gpedit, and press Enter.
Click on Computer Configuration and open Administrative Templates.
Select Windows Components and open Biometrics.
Click on Facial Features and right-click on Configure enhanced anti-spoofing option.
Select Edit and disable the Configure enhanced anti-spoofing feature.
Reboot your PC.

3. Update drivers

If some of the system drivers, most probably webcam and fingerprint reader drivers, were corrupted during the upgrade process, Windows Hello may fail to perform. To fix that, try to update the corresponding drivers:

Right-click on Windows key and select Device Manager.
Locate the Hello, webcam, and fingerprint drivers individually and right-click on each of them.
Select Remove driver software and wait for the removal to be finished.
Repeat the removal with all Windows Hello related drivers and then reboot your PC.
Once done, open Device Manager, click Action -> Scan for hardware changes.
The system should automatically detect and reinstall the drivers.

If none of the methods listed above helped to fix Windows Hello problems, the last thing you should try is resetting your PC. http://www.laptopmag.com/articles/reset-windows...

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But remember that Factory or Upgrade installs are inferior installs which most enthusiasts won't even run because they'd expect endless issues. Consider doing the Clean Install in this link which compiles the best possible install that will stay that way as long as you stick with the tools and methods given: http://answers.microsoft.com/en-us/windows/wiki...

There is also an automated Refresh that reinstalls WIndows while shedding corrupting factory bloatware, saves your files, but doesn't clear the drive to get it cleanest: https://www.howtogeek.com/265054/how-to-easily-...

I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.

Press Windows key + X
Click Device Manager
Expand Cameras
Right click the camera, then click Uninstall

Note: If you don't see it under cameras, look under Imaging devices.

Exit device manager then restart.

Windows 10 should redetect it then reinstall it.

Check if the camera is working again.

If you have a third party Antivirus utility installed, please remove it.
Also check the manufacturers website for updated driver.

Option 1. Press Ctrl + Shift + Esc or right-click empty space on the toolbar.
Open “Task Manager” and go to the “Processes” tab.
Carefully analyze what programs are currently running in the background of the system.
If you found an app that uses Camera, for example, Skype running in the background, click it, and select “End Task.”

Option 2. Try a Clean Boot
Click “Windows key” and type msconfig.
Click “System Configuration” and open “Services” tab.
Mark “Hide all Microsoft services” box and select “Disable all.”
Open “Startup” tab and click “Open Task Manager.”
Click on each startup item and select “Disable.”
Close Task Manager and click “OK” on the System Configuration window.
Reboot the system.

If Clean Boot helped to fix error, we would recommend you to enable apps one by one. After each enabled app, check if the Camera is working. This way, you will isolate the problematic application.