10 Proven Ways How to Fix LogonUI.exe Error in Windows 10 & 11

Fix & Repair Solved issue

Question asked by:

Robert L.

Issue:

Getting a LogonUI.exe Error and cannot login

Ran headfirst into this error, LogonUI.exe's freaking me out and doesn't let me login or do anything. Any of you tackled this beast before? Throw me a life raft, with a fix guide preferably! Thanks!
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LogonUI.exe System Error in Windows can frustrate users because it appears unexpectedly during login.  An essential Windows component manages user logins and displays the login screen.  First, it stops users from logging in or accessing their Windows accounts.  It is incredibly annoying for users who use their computers for work, personal tasks, or other critical tasks.

There is a very high chance users will not know what to do if the error message does not explain what happened or how to fix it (that’s usually the case).

Don’t worry, that’s why we’re here. We’ll explain why it happens and how you can fix it!

How to How to Fix LogonUI.exe Errors in Windows 10 and 11

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LogonUI.exe errors may occasionally be accompanied by other symptoms like system instability, slow performance, or even sporadic crashes, depending on the underlying cause. 
You can diagnose this error by looking at these common causes & fix it rather quickly:

  • Faulty graphics card: graphics card problems can also cause Exception_Illegal_Instructions error. So by fixing or replacing your GPU you could solve 2 problems at once.
  • Issues with the login feature: Sometimes, the login feature on your PC might malfunction when you get this error message. You need to disable the fingerprint scanner, PIN, and other login modes to fix it. We elaborate more on this in the guide below.
  • Corrupt system files: A corrupted or missing system file might cause the problem.  The only solution is to automatically repair and restore the system file.

You will find the genuine LogonUI.exe file in the directory C:/Windows/System32/.  There is a possibility that the LogonUI.exe file is a virus masquerading as a system file if you find it in another folder of your computer. It is recommended that you remove the virus immediately.
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Some users have reported experiencing an error related to LogonUI.exe when logging in to their Windows PC. The error message prevents them from logging in, and they cannot click or do anything. If you have the same problem, here is how to fix the logonUI.exe system/application error.

10 Solutions In Order to Fix LogonUI.exe Error

Solution 1: Start Your PC in “Safe Mode”

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Safe mode can help troubleshoot various issues, including LogonUI.exe Error.  Here are the steps to start your PC in safe mode:

  • First, turn off your computerClick the Start button, select the power icon, and choose “Shut Down.”
  • Power on your computer.  As soon as you see the manufacturer’s logo (e.g., Dell, HP, Lenovo), press and hold the “F8” key repeatedly.  If the F8 key does not work on your system, try “Shift + F8” or “F12.” Alternatively, Shift the key and choose the Restart option from the menu.
  • This action should include the “Advanced Boot Options” menu.  Here, you can navigate using your keyboard’s arrow keys.
Troubleshoot PC
  • Click on the Startup setting option.
Startup settings
  • Choose “Safe Mode with Networking” if internet access is needed in Safe Mode.
  •  Press “Enter” to start your computer in Safe Mode.
Safe Mode with Networking
  • If prompted, enter your username and password.
  • Once logged in, you will be in Safe Mode.

Solution 2: Try “Clean Booting” Your PC

A third-party application may cause a logonui.exe application error on startup.  If so, you should disable all startup applications by performing a safe mode.

  • Press the Windows key + R to open the Run dialog box.  Type “msconfig” and hit Enter.
  • Go to the “Services” tab in System Configuration.
  • At the bottom, check the box “Hide all Microsoft services.” 
  • Click the “Disable All” button. 
Click the "Disable all" button to disable all non-Microsoft services.
  • Next, go to the “Startup” tab.  Click “Open Task Manager.”
  • You will see a list of startup Windows programs in the Task Manager window.  Disable each one by selecting it and clicking the “Disable” button at the bottom.
Open Startup and Click Open Task Manager
  • Close the Task Manager.
  • After closing the System Configuration window, click “Apply” and “OK.”

Now, you will be prompted to restart your computer.  Click “Restart.” to make sure the problem has been resolved.  If the logonui.exe system error on boot persists, we recommend moving to the next solution.

Solution 3: PIN Login and Fingerprint Scanner — Disable It!

Disabling the PIN login and fingerprint scanner in Windows can fix LogonUI.exe errors. 
Here is how to do it:

Disable PIN Login:

  • Press “Win + I” to open the Settings app.
  • Then, navigate to “Accounts.”
WIN I Accounts
  • Select “Sign-in options” from the left sidebar.
  • Under the “PIN” section, click “Remove” and follow the prompts to confirm your PIN removal.
Sign In Options PIN

Disable fingerprint scanner:

  • Repeat the same process mentioned above for disabling PIN.  Then, choose “Windows Hello Fingerprint” and deactivate it.
  • Restart your computer to see if the LogonUI.exe errors have been resolved.  Alternatively, you can try the next solution.

Solution 4: Try Ctrl + Alt + Del Keyboard Command

You can terminate an unresponsive application by pressing Ctrl + Alt + Del. Whenever you receive an error regarding LogonUI.exe, and you can try the keyboard shortcut.  You might not be able to solve this problem permanently, as the error might pop up again next time you open your computer.

Try the next method if Ctrl + Alt + Del does not work.

Solution 5: Disable Antivirus Software and/or Windows Security

Sometimes, disabling antivirus software will help resolve a LogonUI.exe error. 
Here is how to do it:

Windows Security (Windows Defender):

  • Type “Windows Security” in the Windows search bar and press Enter to open it.
  • Click on “Virus & Threat Protection” in the left sidebar.
Virus & Threat Protection
  • Under “Virus & threat protection settings,” click on “Manage settings.”
  • Turn off the “Real-time protection” toggle switch.  Confirm any prompts that appear.
Real-time Protection

Solution 6: Try Disabling or Reinstalling the Graphics Card Adapter

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Sometimes, old or outdated drivers can cause UI problems.  The error may be resolved by updating a senior driver or disabling your GPU.  You can try both methods to fix the LogonUI error.

Disable the Graphics Card Adapter:

  • Press Windows Key + X to open the Power User Menu.  Then select “Device Manager.”
  • Expand the “Display adapters” section in the Device Manager window to see your graphics card(s).
  • Right-click on the graphics card you want to disable and select “Disable device.” Confirm any prompts that appear.
Radeon Update Driver
  • Restart your computer to see if problem is resolved.

Reinstall the Graphics Card Adapter:

  • Repeat the same process mentioned above (to open the device manager).  Select “Display Adapters”
  • Right-click on the graphics card you want to reinstall and select “Uninstall device.” Confirm at any prompts.
Radeon Uninstall Driver
  • Visit the website of your graphics card manufacturer (NVIDIA, AMD, or Intel) and download the latest drivers for your specific card model.
  • Run the downloaded driver package and follow the on-screen instructions to install the new drivers.

After the installation, restart your computer to see if LogonUI.exe error has been resolved.

Solution 7: Run SFC Scan (via CMD) to Restore Corrupted Files

  • Run Command Prompt as an administrator.
  • Enter the following command:
    sfc /scannow
sfc scan now
  • If SFC returned an error, then follow and type these commands and hit Enter after each line:
    DISM /Online /Cleanup-Image /CheckHealth
    DISM /Online /Cleanup-Image /ScanHealth
    DISM /Online /Cleanup-Image /RestoreHealth
DISM Tools

Solution 8: Reset Windows

If nothing works from the above, one of the last resort is to reset Windows.  Resetting your Windows will most likely resolve the issue.

  • Press Win + I to open the “Settings” app.
  • Click on “Update & Security.”
  • In the left sidebar, select “Recovery.”
  • Under the “Reset this PC” section, click the “Get started” button.
  • Choose an Option:
    • Keep my files: This option removes apps and settings but keeps your files.
    • Remove everything: This option removes all your personal files, apps, and settings.
  • Follow the on-screen instructions. 

Solution 9: Turn off Anti-aliasing

  • Open the “Nvidia Control Panel.”
  • Click on “Manage 3D settings” on the left menu.
  • Navigate to the “Global Settings” tab in the right pane.
  • Select “Antialiasing – Mode” and set it to “Off.” Alternatively, you may disable “Multi-Frame Sampled AA (MFAA).”
Turn Off Antialiasing Mode
  • To save the changes, click “Apply.”

Solution 10: Use System Restore (Last Resort Option)

System Restore is an essential feature in Windows that allows you to revert your computer’s system files and settings to a previous state.  Doing a system restore can fix the fix logonui.exe system error.

Here is how to use it:

  • Type “Create a restore point” in the Windows search bar and select it from the results.
  • Navigate to the “System Restore” tab in the System Properties window.
  • Click the “Next” button to begin the System Restore process. 
  • You will see a list of available restore points.  These are times when your system settings and files are saved.  Select a restore point from a time when your computer functioned correctly. 
  • Click “Next” to proceed.
  • Click “Finish” to start the restoration process.
  • Click “Yes” to confirm and start the System Restore process. 

Windows will now restore your system to the chosen point, just like we usually do with installation media.  This may take several minutes, and your computer will restart.  Once the restoration is complete, Windows will notify you if it was successful or if any files could not be restored. 

That’s it! You should have the error fixed by now. Do not panic if you cannot log in to Windows due to the LogonUI.exe error – it’s not a critical error and as you see it can be fixed rather easily and effectively.

However, if you still have problems, we recommend downloading and running the automatic Windows Fix software mentioned below.

We are here to help you with any questions regarding your PC problems – feel free to ask any questions!  Our team of experienced Windows geeks will be happy to assist you.

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About the author
Iggy Shells
Iggy Shells - IT & PC repair expert

Iggy is the founder of WindowsGuided.com. He’s been involved in custom IT and security solutions for more than a decade.

Now he and his team are sharing their knowledge with the world by helping casual users solve a myriad of different computer issues, system errors, and virus/malware infections.