How to Repair: LogonUI.exe Error on Windows 10 Boot/Startup

  • When you turn on your computer, the LogonUI.exe – Application Error message suddenly appears on the login screen, forcing you to shut down your computer to fix the error.
  • The error you get indicates that either the logonui.exe file itself is corrupt, or another program has interfered and is causing Logonui to produce these results.
  • If Windows can’t start normally, start it in Safe Mode.

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  1. Download and install the software.
  2. It will scan your computer to find problems.
  3. The tool will then correct the issues that were discovered.

Logonui Exe Black Screen

To fix this error, we need to go to safe mode with command prompt and log in there to repair the LogonUI program on your computer.

Upon turning on your computer, you see a message that states LogonUI.exe – Application Error. Your computer hangs on this screen before shutting down.

Logon Exe

logon.exe is a process belonging to the adware.abox advertising program. This process monitors your browsing habits and distributes the data back to the author’s servers for analysis. This also prompts advertising popups. This process is a security risk and should be removed from your system.

Non-system processes like logon.exe originate from software you installed on your system. Since most applications store data on your hard disk and in your system’s registry, it is likely that your computer has suffered fragmentation and accumulated invalid entries which can affect your PC’s performance.

Your Amazon EC2 Windows instances can be troubleshooted using EC2Rescue for EC2 Windows. You can use it to troubleshoot OS-level issues as well as gather advanced logs and configuration files for further analysis. Here are some common issues you can resolve with EC2Rescue:

You won’t be able to start Windows if the LogonUI.exe file fails because it controls the login screen interface.

Logonui.exe Black Screen

On bootup, I receive the message “The file may be corrupt. The header checksum is not the same as the computed checksum.”.

With that in mind, let’s move on to the next section of our troubleshooting guide for Logonui.exe.

What causes a LogonUI.exe error during BOOT/Startup?

The Logonui.exe file itself, or another program, may be corrupt and causing this error, though the Logonui.exe file itself may be fine.

How to troubleshoot the LogonUI.exe error in BOOT/Startup?

Updated: February 2024

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Launch SFC and DISM scans

  1. You can open Command Prompt (Admin) by pressing Windows + X.
  2. PowerShell (Admin) or the command line can be selected if you do not have access to the command line.
  3. When the command prompt opens, type sfc /scannow and press Enter to start.
  4. Approximately ten minutes will pass before scanning begins. Do not interrupt this process.

Reinstall the video card driver

  1. Using Safe Mode will help you start Windows in case it can’t be started normally.
  2. You can now uninstall your video card from the Device Manager by right-clicking on it.
  3. You will see a confirmation dialog box. Click the Uninstall button to remove the driver software.

Perform the system restore

  1. Select the Create Restore Point option from the menu when you press Windows + S to invoke System Restore.
  2. Select the System Restore option in the System Properties window.
  3. You will be taken to the System Restore window. Click Next to proceed.
  4. As soon as the restore point list appears, click Show other restore points if it is available.
  5. Click Next to continue once you have selected your restore point.
  6. The recovery process can be completed by following the instructions on-screen.

Reset Windows 10 settings

  1. When the boot sequence is complete, reboot your computer a number of times.
  2. Reset this PC, then delete all items under Troubleshooting.
  3. You will need the Windows 10 installation media to proceed to the next step.
  4. Delete my files only for the drive where Windows is installed based on your Windows version.
  5. As a result, changes have now been made. To begin the reset process, click the Reset button.
  6. The Windows 10 reset can now be completed by following the instructions on the screen.

RECOMMENATION: Click here for help with Windows errors.

Frequently Asked Questions

  1. Press CTRL+ALT+Del to open Task Manager.
  2. If you find that logonui.exe is outside the specified c:{windows\system32 directory, you need to run a virus scan to get rid of the malware.

LogonUI.exe is the Windows program that is responsible for the interface you see on the login screen. It allows you to start the PC only after the user enters the correct password and account username associated with the welcome interface.

  1. Open the Start menu and click on the Power icon.
  2. Now hold down the Shift key and select Reboot from the menu.
  3. Now select Advanced Options -> Startup Options. Click the Restart button.
  4. When the PC restarts, you will be presented with a list of options.

The LogonUI is the Windows program that is responsible for the interface you see on the login screen. The error message you get indicates that the Logonui.exe file itself has been corrupted or that another program has interfered and caused LogonUI to produce these results.

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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog,, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.