Top 10 Solutions to Fix LogonUI.exe Application Error on Windows

What Is LogonUI.exe?

LogonUI.exe (Windows Logon User Interface Host) is a legitimate Microsoft process responsible for the graphical interface you see on your login and lock screens.

This critical system component is located at C:\Windows\System32\LogonUI.exe. However, malware occasionally disguises itself with the same name. You should be suspicious if:

• The file is located anywhere other than the System32 folder.
• It consumes high CPU or memory for long periods.
• It appears in Task Manager while you are already logged in and not on the lock screen.

Some users reported that they encountered the LogonUI.exe application error at the login screen. Here are the most common causes:

• Corrupted system files
• Third-party software conflicts
• Hardware failure
• Graphics driver issues

Now, try the following methods to solve it.

Solution 1: Try Ctrl + Alt + Del

The keyboard shortcut Ctrl + Alt + Del enables you to terminate the unresponsive application. When you receive LogonUI.exe application error, you can try the keyboard shortcut. This might not be a permanent solution, as the mentioned error could appear again the next time you launch your PC.

If Ctrl + Alt + Del doesn’t work in your case, you need to move on to the next method.

Solution 2: Disable Security Programs for Login

Some security programs for facial recognition might be incompatible with Windows 10. If you have installed any software such as FastAccess by Sensible Vision, you might encounter LogonUI.exe error. To solve the problem, you need to uninstall it in Safe Mode. Here are the detailed steps.

Step 1: After entering Safe Mode, press Win + R to invoke Run window. Then type appwiz.cpl in the box and press Enter to view your installed programs and features.

Step 2: Right-click FastAccess or other security software for login and select Uninstall.

Step 3: Follow the onscreen instructions to finish the uninstallation.

Then you can restart your PC to get out of Safe Mode and check if LogonUI.exe error message disappears.

Some users report that LogonUI.exe error could also be related to the PIN login. If you have enabled the service, you can try disabling the PIN in Safe Mode to fix the mentioned error.

Solution 3: Disable Antivirus Software

Third-party antivirus software might also be a reason why you encounter LogonUI.exe error. If you haven’t installed any security programs for login or the second solution doesn’t work in your case, you should disable or uninstall the third-party antivirus software you are using. Then check if the problem has been fixed.

Solution 4: Disable Graphics Card Adapter

Problematic graphics card adapter might also lead to LogonUI.exe error on Windows 10. To fix the problem, you can try disabling the graphics card adapter. Of course, you need to enter Safe Mode at first. Then follow the steps below the disable it.

Step 1: Right-click Start button and select Device Manager.

Step 2: Double-click Display adapter to expand it and view your graphics card.

Step 3: Right-click your graphics card and choose Disable device.

Step 4: In the pop-up window, click Yes to make sure that you want to disable the device.

After that, you can restart your PC. If you can log in and enter the system without LogonUI.exe error, you can open Device Manager and enable the graphics card adapter, and then use the PC as you want.

Solution 5: Run SFC and DISM Scan

A LogonUI.exe application error can also occur if there are corrupted or missing system files. In this case, you should run System File Checker (SFC) and Deployment Image Servicing and Management (DISM) to remove the error.

Here are the steps:

1. Type cmd in the search bar, right-click Command Prompt, and then select Run as administrator.
2. Type DISM /Online /Cleanup-Image /RestoreHealth and press Enter.
3. After the DISM process finishes, type sfc /scannow and press Enter.

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Solution 6: Perform a Clean Boot

As mentioned, some third-party security or antivirus software could cause the problem we are talking about. You should know that some other types of applications or services might also be responsible for the issue. To figure out the problematic programs or services, you can perform a clean boot to disable them all and enable them one by one.

Here is the tutorial.

Step 1: Open Run window. Then type msconfig and press Enter to go to System Configuration.

Step 2: Select Services tab, uncheck Hide all Microsoft services, and click Disable all.

Step 3: Switch to Startup tab and click Open Task Manager. In the pop-up window, select each item and click Disable to prevent them from running on startup.

Step 4: Close Task Manager and go back to System Configuration. Then click Apply and OK.

After disabling the applications and services, you can restart the PC. If the LogonUI.exe application error doesn’t pop up, it indicates that one of the disabled services is the culprit of the problem, and you can enable them one by one to find it out.

Then you should keep the problematic service disabled or remove it completely.

Solution 7: Run Startup/Automatic Repair

If you don’t find any problematic applications or you receive the same error in Safe Mode, you can try Automatic Repair. You should enter WinRE by shutting down and restarting your PC three times. Then go to Advanced options > Troubleshoot > Advanced options > Startup/Automatic Repair. When the Startup/Automatic Repair finishes, you can restart the PC and log in.

Solution 8: Check Hardware for Errors

Hardware issues like RAM and hard drives can also trigger the LogonUI.exe application error. To fix this issue, you should check the hardware for errors.

If you cannot log in normally, you need to run this utility from the WinRE following the steps above.

Step 1. Check RAM issues using Windows Memory Diagnostic.

1. Press Win + R, type exe, and press Enter.
2. Choose Restart now and check for problems.
3. The computer will restart and run a blue-screen diagnostic. Once it finishes, Windows will reboot.
4. To see the results, search for Event Viewer, go to Windows Logs > System, and look for MemoryDiagnostics-Results.

If you cannot log in, enter WinRE, and then type mdsched.exe in Command Prompt.

Step 2. Check the hard drive errors using the CHKDSK utility.

1. On the Advanced options window, choose Command Prompt.
2. Then run chkdsk /f to find and fix file system errors on your hard drive.

Solution 9: Perform System Restore

If you have created a restore point, you can perform System Restore to restore your PC to earlier date, which might be helpful to solve LogonUI.exe error. Please go to WinRE and navigate to Advanced options > System Restore. Then select the administrator account, enter your password, and follow the instructions to complete it and solve the problem.

Solution 10: Reinstall Windows 10

If none of the solutions mentioned above resolve the LogoUI.exe application error, you may need to reinstall Windows. It is recommended that, before reinstalling the operating system, you first recover any lost data from the system partition and save it to a separate drive.

For professional data recovery tools, you can use MiniTool Partition Wizard. It features a “Bootable Media Builder” function that allows you to create a bootable USB flash drive, CD, or DVD to boot up the malfunctioning computer.

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Next, let’s look at how to recover data from the system drive and reinstall Windows.

Step 1. Recover data from the system drive using MiniTool Partition Wizard.

1. Download and install MiniTool Partition Wizard on another normal PC.
2. Create a bootable USB drive with MiniTool Partition Wizard.
3. Boot the problematic PC from the burned USB drive, and you will enter the main interface of MiniTool Partition Wizard.
4. Right-click the system partition and select Data Recovery. Then MiniTool Partition Wizard will start scanning your system partition. Your system partition might not be assigned the letter C in the bootable edition of MiniTool Partition Wizard.
5. After scanning, you can check the files you need and click Save.
6. Select another drive to save your important files

Step 2. Reinstall Windows.

1. Connect a USB drive to another working PC, download the Windows 10 Media Creation tool or Windows 11 Installation Assistant, and run it on this PC.
2. Select Create installation media (USB flash drive, DVD, or ISO file) for another PC. Then click Next and follow the onscreen instructions to finish the operation.
3. Boot the PC from which you want to reinstall Windows from the USB drive. Then configure your preferences and click Install now.
4. Follow the instructions to reinstall Windows. During the processes, several reinstall options will be available, and you can choose to keep your apps and settings or remove all according to your needs.

After reinstalling Windows 10, you should be able to use this PC again.

You can try the solutions in this post to fix the problem if you encounter LogonUI.exe application error on Windows 10.Click to tweet

Bottom Line

This post analyzes the possible causes of the LogonUI.exe application error and provides the corresponding solutions.

If you encounter any issues while using MiniTool Partition Wizard, you can contact our support team via [email protected].

LogonUI.exe Application Error FAQ