Avast Antivirus: Troubleshooting when the "Base Filtering Engine service is not running" error appears during the Avast setup


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

The BFE service controls the operation of the Windows Filtering Platform. This service is essential for the 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 need to restore and start the BFE service.


Ensure that the Windows Base Filtering Engine service is running by following these steps.

Before you begin, make sure you are logged in to Windows as a user with administrator permissions.
  1. Press Win + R to run the Windows Services console, then type services.msc in the field and click OK. The Services console appears.
  2. Locate Base Filtering Engine in the Windows Services console, and check the Status column. The status needs to display the text Running before you can continue installing Avast. If the status is blank, it means the service is not running.
  3. Right-click Base Filtering Engine in the list and select Start to enable the BFE service. If the BFE service does not start, select a method below and use the instructions in the relevant article:
  4. Go back to the Avast Antivirus setup and click Retry to continue the installation or use the following links to install Avast from the beginning:

Further recommendations

When you have successfully installed Avast on your PC, it is recommended to use these additional steps:

  • Run a Boot-time scan to check for any malware that may try to disable the BFE service again. For more details, read the following article:

  • Run Software Updater to ensure vulnerable applications are up to date. Certain applications, such as Adobe Flash Player, may be out of date and malware can exploit security vulnerabilities in the out of date version. For more details, read the following article:

  • Ensure that there is no other third-party antivirus software installed, including expired or trial versions. Having more than one security product on your system can lead to conflicts such as false positive detections. For more details, 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, read one of the following Microsoft articles according to your version of Windows:
  • Avast Premier 17.x
  • Avast Internet Security 17.x
  • Avast Pro Antivirus 17.x
  • Avast Free Antivirus 17.x
  • 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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