3 Steps to Download and Fix Libav.dll DLL Errors

Last Updated: 11/26/2023
[Time to Read Article: 5 minutes]

libav.dll, also known as a AV Engine Library file, was created by Fortinet for the development of Fortinet AV Engine Library. DLL files fall under under the Win32 DLL (Dynamic link library) file type category.

The first version of libav.dll was released for the Windows 10 Operating System on 08/08/2013 inside FortiClient 5.0.5. This is not only most recent release from Fortinet, but it's the only version known in existence.

Please see below for more detailed information, DLL file troubleshooting instructions, and free downloads of different versions of libav.dll.

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File Overview


General Information
File Name: libav.dll
File Extension: DLL file extension
Description: AV Engine Library
Object File Type: Dynamic link library
File Operating System: Windows NT 32-bit
MIME Type: application/octet-stream
User Popularity Rating:
 
Developer and Software Information
Software Developer: Fortinet Inc.
Software Program: Fortinet AV Engine Library
Legal Copyright: Copyright © Fortinet Inc.
File Details
Character Set: Unicode
Language Code: English (U.S.)
File Flags: (none)
File Flags Mask: 0x003f
Entry Point: 0x147c7d
Code Size: 1368064


What are libav.dll Error Messages?


Dynamic Link Library libav.dll Errors

libav.dll is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like libav.dll, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like certutil.exe - to follow. These files were created so that multiple programs (eg. FortiClient) could share the same libav.dll file, saving valuable memory allocation, therefore making your computer run more efficiently.

Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. If something happens to a shared DLL file, either it goes missing or gets corrupted in some way, it can generate a "runtime" error message. Runtime is pretty self-explanatory; it means that these errors are triggered when libav.dll is attempted to be loaded either when FortiClient is starting up, or in some cases already running. Some of the most common libav.dll errors include:

Your libav.dll file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with FortiClient), or deleted by a malware infection. Furthermore, libav.dll file corruption could be caused from a power outage when loading FortiClient, system crash while loading libav.dll, bad sectors on your storage media (usually your primary hard drive), or quite commonly, a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.



How to Fix libav.dll Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your libav.dll issue. These troubleshooting steps are listed in the recommended order of execution.


Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. When you see the search box, type "System Restore" and press "ENTER".
  3. In the search results, find and click System Restore.
  4. Please enter the administrator password (if applicable / prompted).
  5. Follow the steps in the System Restore Wizard to choose a relevant restore point.
  6. Restore your computer to that backup image.

If the Step 1 fails to resolve the libav.dll error, please proceed to the Step 2 below.

Step 2: If recently installed FortiClient (or related software), uninstall then try reinstalling FortiClient software.

You can uninstall FortiClient software by following these instructions (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. In the search box, type "Uninstall" and press "ENTER".
  3. In the search results, find and click "Add or Remove Programs"
  4. Find the entry for FortiClient 5.0.5 and click "Uninstall"
  5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall FortiClient software.

If this Step 2 fails as well, please proceed to the Step 3 below.

FortiClient 5.0.5

Fortinet

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many libav.dll error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

  1. Hit the Windows Start button
  2. In the search box, type "Update" and press "ENTER".
  3. In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
  4. If updates are available for download, click "Install Updates".
  5. After the update is completed, restart your PC.

If Windows Update failed to resolve the libav.dll error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.



If Those Steps Fail: Download and Replace Your libav.dll File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate libav.dll file version. We maintain a comprehensive database of 100% malware-free libav.dll files for every applicable version of FortiClient. Please follow the steps below to download and properly replace you file:

  1. Locate your Windows operating system version in the list of below "Download libav.dll Files".
  2. Click the appropriate "Download Now" button and download your Windows file version.
  3. Copy this file to the appropriate FortiClient folder location:
    Windows 10: C:\Users\Tester\AppData\Local\Temp\FCPreScan\
    Windows 10: C:\Program Files\Fortinet\FortiClient\
  4. Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.


GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve libav.dll problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.



Download libav.dll Files (Malware-Tested 100% Clean)


CAUTION : We strongly advise against downloading and copying libav.dll to your appropriate Windows system directory. Fortinet typically does not release FortiClient DLL files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing libav.dll and all other DLL files for FortiClient. An incorrectly installed DLL file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows 10


Files Related to libav.dll


DLL Files Related to libav.dll

File Name Description Software Program (Version) File Size (bytes) File Location
msvcr120.dll Microsoft® C Runtime Library Microsoft® Visual Studio® 2013 (12.00.21005.1) 963232 C:\Windows\Microsoft.NET\Framework64\v4.0.30319\
Qt5QuickControls2.dll C++ Application Development Framework Qt5 (5.11.1.0) 153960 C:\Users\Tester\AppData\Local\Microsoft\Windows\
WindowsBase.ni.dll Dynamic Link Library FortiClient 5.0.5 4978176 C:\Program Files\Common Files\microsoft shared\...
vccorlib120.dll Microsoft ® VC WinRT core library Microsoft® Visual Studio® 2013 (12.0.21005.1) 356528 C:\Users\Tester\AppData\Local\Microsoft\Windows...
api-ms-win-core-heap-l... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17134.12) 11112 C:\$WINDOWS.~BT\Sources\Boot\EFI\nl-NL\

Other Files Related to libav.dll

File Name Description Software Program (Version) File Size (bytes) File Location
netpacer.PNF Precompiled INF FortiClient 5.0.5 7484 C:\Windows\System32\DriverStore\FileRepository\...
netnwifi.PNF Precompiled INF FortiClient 5.0.5 6148 C:\Windows\System32\DriverStore\FileRepository\...
WmiApRpl.ini Windows Initialization FortiClient 5.0.5 29736 C:\Windows\inf\WmiApRpl\0009\
api-ms-win-core-debug-... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.10586.15) 19328 C:\Program Files\Fortinet\FortiClient\
BootCKCL.etl Microsoft Event Trace Log FortiClient 5.0.5 17825792 C:\Windows\System32\wdi\LogFiles\


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