Computer will not boot. Log file gives error code 0x3f1 on check for installed LCU.

Question

How can I repair this?

Answer 1

You can also try to reset your computer using Media Creation Tool. You will have to cut Media creation tool on another computer.

Refer to the section"Use installation media to restore or reset your PC "

Recovery options in Windows 10 - https://support.microsoft.com/en-in/help/12415/...

Note - You will get the option to keep your files. But it will remove third party apps including Microsoft Office which will need to be reinstalled. Default Windows 10 apps will be automatically installed. But non-defaults Windows 10 apps will need to be reinstalled.

Answer 2

Hi Jack

My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.

Power on and off your computer three times

How do you do that?

Power on, when you see the Windows Logo - power off

Power on, when you see the Windows Logo - power off

Power on, it will then your computer will boot into the Advanced Recovery environment

You might be asked to sign in with your Microsoft Account or Local Account password.

Click Advanced Options

Click Troubleshoot

Click Advanced Options

Click System Restore, see if you can go back to an earlier time.

If not, boot into the recovery environment again, then try performing a startup repair.

Perform the startup repair a couple more times then restart again to see if you are able to boot to the desktop successfully.

If that does not work, boot into the recovery environment, then click 'Go back to previous version of Windows'

If that does not work.

Power on and off your computer three times

On the third time, your computer will boot into the Advanced Recovery environment

Click Advanced Options

Click Troubleshoot

Click Reset this PC

Click Keep my files

Choose your account

Enter your password

Click Continue

Click Reset

If that does not work.

Go to a working computer, download, create a bootable copy, then perform a clean install.

	Step 1: How to download official Windows 10 ISO files 

	[http://answers.microsoft.com/en-us/windows/wiki...](http://answers.microsoft.com/en-us/windows/wiki/windows_10-windows_install/how-to-download-official-windows-10-iso-files/35cde7ec-5b6f-481c-a02d-dadf465df326)



	Step 2: How to: Perform a clean install of Windows 10

	[http://answers.microsoft.com/en-us/insider/wiki...](http://answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_install/how-to-do-a-clean-install-of-windows-10/aef0ae63-2117-41ee-a8ea-4a3181625b08)



If there are files on the drive you want to recover, see -  How to: Perform a Custom install of Windows 10

http://answers.microsoft.com/en-us/insider/wiki...

Step 4: how to recover your files from Windows.old:

https://answers.microsoft.com/en-us/windows/for...

Answer 3

Thanks for your help. I had already tried most of the suggestions except for a clean boot. When I try a reset the reset fails and  reports bad system configuration information. tonight I will try a clean install. If you have suggestions for the system config info I would appreciate it. There was a momentary power interruption yesterday and the computer would not boot following the power interruption.

Answer 4

Hi JackJones_614

I am Vijay, an Independent Advisor. I am here to work with you on this problem.

A. Try to boot into safe mode

Power ON your computer and as Windows / manufacturer's Logo appears, Power OFF - Repeat 3 times

Now your computer will go into Advanced Recovery Environment

Advanced Options > Troubleshoot > Advanced Options > Startup Settings > Restart

Press 4 or F4 to enable Safe Mode (5 or F5 to enable Safe Mode with Networking)

Log in once Windows starts in safe mode

See whether you able to login. If yes, come out of this and start normally.

If you are not able to boot like above, You will need to boot through a Bootable USB drive. You will need to create this on another computer which is working - https://www.tenforums.com/tutorials/2376-create...

How to Boot from a USB Flash Drive in Windows 10 - https://www.tenforums.com/tutorials/21756-boot-...

B. Another option when you are in Advanced Options in previous step is to choose (Note - You won't lose any files in this step)

1. System Restore - This will restore your system to a point when things were working fine.

OR

2. Startup Repair - Startup Repair upgrade fixes all Windows errors and retains all files, applications and settings.

C. Penultimate option could be Reset this PC.

In Step A > Troubleshoot > Reset this PC - Keep my files and Remove everything. Choose this carefully as most likely you would like to keep your files.

All apps will be removed and windows will be reinstalled.

D. Last option could be a clean Install. This is the best method to perform a clean install of Windows 10. (If you want to rescue your files, there is a section Rescue Files when Windows Won't Start)

https://answers.microsoft.com/en-us/windows/for...

If you want a very lightweight guide - Start fresh with a clean installation of Windows 10

https://www.microsoft.com/en-us/software-downlo...

Disclaimer - This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.