How to fix
FirewallAPI.dll Not Found Error
on Windows

Recently the system started delivering pop-up alerts reporting about missing FirewallAPI.dll. Why does this error occur?

Each DLL file on your PC has a particular and crucial function. In general, DLL files are responsible for serving multiple software to ensure the same functionality.  Thus, if your machine encounters a problem, particularly with the registries, EXE, and DLL files, errors occur, and you may not be allowed to use particular software.

If you have received an error FirewallAPI.dll, it means that this DLL file has been corrupted or damaged. In some of the cases, it might be accidentally displaced. However, in most of the case, this error is triggered by a malicious computer infection, i.e. worm Win32/Cerohar.A. According to PC specialists, this worm might get into the system via social network Myspace. As soon as the worm affects the PC, it corrupts the path of FirewallAPI.dll to C:\WINDOWS\System32\. Consequently, you may not be allowed to access Opera, Antivirus VIPRE Internet Security, and so on.

However, there are many more reasons why this error may occur. Therefore, in the next paragraph, we will provide all the possible methods that could help you with the missing FirewallAPI.dll error.

As soon as the FirewallAPI.dll file gets damaged, the user receives as Blue Screen of Death (BSOD) that indicates an error code 0X9012537. In addition, one of the following statements can be included:

“FirewallAPI.dll not found.”
“The file FirewallAPI.dll is missing.”
“FirewallAPI.dll Access Violation.”
“Cannot register FirewallAPI.dll.”
“Cannot find C:\Windows\System32\\FirewallAPI.dll.”
“Cannot start MSDN Disc 4616.01. A required component is missing: FirewallAPI.dll. Please install MSDN
“This application failed to start because FirewallAPI.dll was not found. Re-installing the application may fix this problem.”

If you are facing FirewallAPI.dll error and don’t know how to fix it, stick to this post and find the appropriate fixes down below:

How to fix Missing FirewallAPI.dll Error on Windows?

It's very important not to ignore FirewallAPI.dll error because it may lead to serious technical issues. Therefore, as soom as you start facing this issue, take some corresponding steps and fix it.

1. Reboot the system's

As we have already mentioned, as soon as you receive FirewallAPI.dll error, reboot your PC because the error may be temporary and system restart may help to fix that. If that did not help, then follow the further instructions.

2. Run a reputable anti-virus

Keeping in mind that FirewallAPI.dll error may be triggered by a virus/malware infection, a full system scan with a reliable anti-spyware will help to remove all potentially unwanted and really dangerous programs that may cause such and similar issues.

3. Backup Windows registry

In case the error we are discussing at the moment is caused by registry issues, registry backup may be the solution. For that you have to:

• Open 'Start' menu;
• In the search box type 'regedit' and click OK in order to open Registry Editor;
• Double-click on the File menu and select Export;
• When a pop-up window shows, select the destination folder to locate backups.
• In the ‘Export Range’ choose All;
• Enter backup file name and then click Save button.

In order to restore the registry, you will have to:

• Open Registry Editor;
• Select File → Import;
• Find the backup file that have just been created;
• Select it and click Open button;
• Reboot the system.

4. Reinstall FirewallAPI.dll file

In case FirewallAPI.dll file has accidentally been removed, you are strongly advised to download it and reinstall. NOTE: make sure that you select a reliable download source because very frequently .dll and .exe files are used for spreading viruses.

5. Update OS or drivers

As we have noted, OS and drivers incompatibilities may be another reason of missing FirewallAPI.dll error. The problem that such a solution requires more knowledge than a beginner or intermediate computer user has. Therefore, ordinary users may initiate such updates incorrectly and cause even more damage.

6. Use [d1] or [rev id=”RegCure Pro”]

In some of the cases it may appear that it's not that easy to fix FirewallAPI.dll error manually. There may be a bunch of problems that are difficult to detect without using an automated PC optimization tool. Therefore, we highly recommend you to install [d1] or [rev id=”RegCure Pro”] program and fix this missing dll automatically.