Avast 2015: Troubleshooting issues caused by Base Filtering Engine


Avast setup reports that The Base Filtering Engine (BFE) is not running. Avast installation cannot continue until BFE service is restored and running.

The BFE service controls the operation of the Windows Filtering Platform. This service is essential for operation of many firewall products including Avast.

This issue may be a result of active malware which has disabled, terminated, or removed the Windows BFE service to prevent detection. It may also result from changes made to your system files or registry from a "PC tune up" software.

To resolve this problem, you must restore and start the BFE service.

Ensure that the Windows Base Filtering Engine service is running according to the steps below.

Before you begin, make sure you are logged in to Windows as a user with administrator permissions.
  1. Run the Windows Services console. Press Win + R, ...type services.msc in the field and press Enter. The Services console appears.
  2. In the Windows Services console, locate Base Filtering Engine in the list, and check the Status column. The service must be Running before you can continue installing Avast. If the status is blank, it means the service is not running.
  3. To start the BFE service, right-click Base Filtering Engine in the list and select Start. If the BFE service does not start, you may need to repair it. To do so, please see this article on Microsoft's website: If the BFE service still does not start, you may need to remove malware which is blocking it. To do so, please run the Avast Rescue Disk according to the instructions in this article:
  4. Continue with your Avast installation.

Further recommendations

When you have successfully installed Avast on your PC, it is recommended to also take these steps.

  • Run a Boot-time scan to check for any malware. If there is malware present in the system it may try to disable the BFE service again.

    For more details please read the following article:

  • Run Software Updater to make sure vulnerable applications are up to date. This is because certain applications such as Adobe Flashplayer may be out of date, and malware can exploit security vulnerabilities in the out of date version.

    For more details please read the following article:

  • Double-check that there is no other third-party antivirus software installed, including expired or trial versions. This is because having more than one security software on your system can lead to conflicts such as false positive detections.

    For more details please read the following article:

  • Consider uninstalling any "PC tune up" software. Such applications can make changes to your critical system files or Windows registry, which may interfere with services such as BFE.

    For more details please see the articles linked below.
  • Avast Premier 2015
  • Avast Internet Security 2015
  • Avast Pro Antivirus 2015
  • Avast Free Antivirus 2015
  • Microsoft Windows 10 Home / Pro / Enterprise / Education
  • Microsoft Windows 8.1 / Pro /Enterprise
  • Microsoft Windows 8 / Pro / Enterprise
  • Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate
  • Microsoft Windows Vista Home Basic / Home Premium / Business / Enterprise / Ultimate
  • Microsoft Windows XP Home / Professional / Media Center Edition

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