How to Fix AppLockerCSP.dll Missing Error (Solved)

What is AppLockerCSP.dll?

AppLockerCSP.dll is a Dynamic Link Library (DLL) file associated with the Microsoft Application Lockdown feature, known as AppLocker in Windows operating systems. This component helps administrators control and manage the applications that are permitted or denied to run on specific user accounts or groups within an organization.

Why is AppLockerCSP.dll missing?

The AppLockerCSP.dll file may go missing due to various reasons, such as:

• Malware attacks: Malicious software can corrupt or delete essential system files, including DLLs like AppLockerCSP.dll.
• Accidental deletion: Users might inadvertently remove the file during routine maintenance tasks or while trying to troubleshoot other issues.

Step-by-Step Fixes

Method 1: Reinstall Visual C++ Redistributable

The AppLockerCSP.dll file is often linked to the Microsoft Visual C++ Redistributable package. To resolve the issue, reinstall the relevant version of Visual C++ Redistributable:

1. Download the appropriate version of Visual C++ Redistributable from the official Microsoft website.
2. Run the downloaded executable file and follow the on-screen instructions to complete the installation process.

Method 2: Run SFC /scannow command

The System File Checker (SFC) tool can help repair missing or corrupted system files, including DLLs. To run the SFC command:

1. Press Windows Key + X and select “Command Prompt (Admin)” or “PowerShell (Admin)” from the menu.
2. Type `sfc /scannow` and press Enter to start the scan.
3. Wait for the scan to complete, and follow any on-screen instructions that may appear during the process.

Method 3: Update System Drivers

Outdated system drivers can cause various issues, including missing DLL files. To update your system drivers:

1. Press Windows Key + X and select “Device Manager” from the menu.
2. Locate the problematic device driver, right-click on it, and choose “Update Driver.”
3. Select “Search automatically for updated driver software” and follow the prompts to complete the update process.

Conclusion

When encountering the AppLockerCSP.dll missing error, try reinstalling Visual C++ Redistributable, running the SFC /scannow command, or updating system drivers. By following these steps, you should be able to resolve the issue and restore the functionality of your Windows operating system.