Logonui.exe Entry Point Not Found

9 min read Oct 10, 2024

The "logonui.exe Entry Point Not Found" Error: A Guide to Troubleshooting

Have you encountered the dreaded "logonui.exe Entry Point Not Found" error? This error message pops up during the Windows login process, preventing you from accessing your system. It's a frustrating issue, but luckily, there are several solutions you can try to fix it.

This error typically arises due to corrupted or missing system files, particularly those related to the Windows login process. Understanding the cause is crucial to identifying the appropriate fix. Let's explore the common culprits and how to resolve them.

What is logonui.exe?

logonui.exe is a crucial executable file responsible for handling the Windows login screen, including the login fields, password input, and user account selection. When this file is damaged or missing, the system fails to load it properly, leading to the "entry point not found" error.

Possible Causes of the "logonui.exe Entry Point Not Found" Error

Corrupted System Files: The most common culprit is corrupted system files, often due to faulty software installations, malware infections, or improper system shutdowns. These corrupted files can disrupt the functionality of logonui.exe.
Missing or Incorrectly Registered Files: A missing or incorrectly registered logonui.exe file can also trigger the error. This may happen after a software update or a hardware failure.
Outdated Drivers: Outdated drivers for your hardware components, such as the graphics card, can sometimes cause conflicts with the login process, leading to the error.
Malware: Malware infections can significantly impact system files, including logonui.exe, leading to the "entry point not found" error.

How to Fix the "logonui.exe Entry Point Not Found" Error

1. System File Checker (SFC) Scan:

This built-in Windows tool scans for and repairs corrupted system files.
Open Command Prompt as Administrator: Search for "cmd" in the Start menu, right-click on the result, and select "Run as administrator".
Run the SFC scan: Type the command sfc /scannow and press Enter.
The scan may take some time. Once complete, reboot your system and see if the error persists.

2. DISM (Deployment Image Servicing and Management):

If SFC fails to resolve the issue, try DISM. It helps repair corrupted system images.
Open Command Prompt as Administrator: Follow the same steps as above.
Run the DISM command: Type the following command and press Enter: DISM /Online /Cleanup-Image /RestoreHealth
This process may take longer than SFC. After completion, restart your computer and check if the error is gone.

3. Reinstall Windows:

If the previous solutions fail, reinstalling Windows might be necessary to resolve the issue.
Create a backup of your important data: Before reinstalling, make sure to back up your personal files, documents, and other important data to avoid data loss.
Follow the Windows installation steps: Insert the Windows installation media (DVD or USB drive), and follow the on-screen instructions.

4. Run a Malware Scan:

If you suspect malware might be causing the problem, run a comprehensive scan using a reputable antivirus program.
Update your antivirus software: Ensure your antivirus is up-to-date with the latest malware definitions.
Scan your entire system: Perform a full system scan to detect and remove any malware.

5. Update or Reinstall Graphics Drivers:

Outdated graphics drivers can cause conflicts with the login process. Update them to the latest versions.
Visit the manufacturer's website: Find your graphics card model and download the latest drivers from the manufacturer's website (e.g., NVIDIA, AMD).
Install the drivers: Follow the installation instructions provided by the manufacturer.

**6. Re-register logonui.exe:

This step helps to correct any registration issues with logonui.exe.
Open Command Prompt as Administrator: Follow the steps outlined earlier.
Run the following command: regsvr32 logonui.exe

7. Boot into Safe Mode:

Safe Mode starts Windows with a minimal set of drivers and programs, helping you diagnose the issue.
Restart your computer and press F8 repeatedly: This usually brings up the Advanced Boot Options menu.
Select Safe Mode: Choose the option "Safe Mode with Networking" or "Safe Mode" if you need to access the internet.
Once in Safe Mode, try the solutions mentioned above.

8. Check for Hardware Issues:

If the issue persists after trying the solutions above, consider checking your hardware for potential problems.
Ensure proper connections: Make sure all cables and connections to your motherboard and drives are securely connected.
Test your RAM: Run a memory test to check for RAM errors using the built-in Windows Memory Diagnostic tool.
Check your hard drive: Use the built-in Check Disk tool to scan your hard drive for errors.

Conclusion

The "logonui.exe Entry Point Not Found" error can be a frustrating obstacle, but it's usually fixable with a systematic approach. Start with the System File Checker and DISM scans, and work your way through the other solutions until the error is resolved. If you suspect malware, run a thorough antivirus scan. If all else fails, consider reinstalling Windows as a last resort.

By diligently implementing these troubleshooting steps, you can effectively address the error and regain access to your Windows system. Remember to back up your data before making any major changes, and consult with a professional if you're unsure about any of the procedures.