How to Fix authui.dll Missing Error (Solved)

What is authui.dll?

authui.dll, short for Authenticode UI DLL, is a Dynamic Link Library (DLL) file that plays an essential role in the Windows operating system. This particular DLL file is responsible for handling digital certificates and providing a user interface when dealing with files that have Authenticode digital signatures. These signatures help ensure the integrity and authenticity of software installations.

Why is authui.dll missing?

There are several reasons why the authui.dll file might be missing from your system, including:

• Malware Infection: Malicious software may inadvertently delete or corrupt the authui.dll file during its operations.
• Accidental Deletion: Users might accidentally remove the authui.dll file when performing system maintenance tasks such as cleaning up unnecessary files or when reinstalling software that requires this DLL.

Step-by-Step Fixes:

Method 1: Reinstall Visual C++ Redistributable

The authui.dll file may be part of the Microsoft Visual C++ Redistributable package. If you have uninstalled this package or it becomes corrupted, you can reinstall it to solve the issue:

1. Visit the official Microsoft Download Center at this link.
2. Download and install the appropriate Visual C++ Redistributable package for your system (32-bit or 64-bit).
3. Restart your computer to allow the changes to take effect.

Method 2: Run SFC /scannow command

The System File Checker (SFC) tool can help repair missing or corrupted system files, including authui.dll:

1. Search for ‘Command Prompt’ in the Start menu and right-click on the result to select ‘Run as administrator’.
2. Type the following command and press Enter: sfc /scannow
3. Wait for the scan to complete. If the authui.dll file is found to be corrupt, it will be automatically repaired.

Method 3: Update System Drivers

Outdated drivers can sometimes cause compatibility issues with system files like authui.dll. Updating your drivers may help resolve the problem:

1. Search for ‘Device Manager’ in the Start menu and open it.
2. Find the device category that needs a driver update and expand it by clicking on the arrow next to it.
3. Right-click on the device and select ‘Update Driver’.
4. Choose ‘Search automatically for updated driver software’ and follow the on-screen instructions to install any available updates.

Conclusion

By following one or more of these methods, you should be able to resolve the authui.dll missing error in your Windows system. If none of these solutions work, it may indicate a more severe issue that requires further investigation and possibly professional assistance.