How to Repair the “Virus Definitions Update Failed” Issue on Avast Antivirus

Do you get the “Virus Definition Failed” error message when you try to update virus definitions and you’ve tried everything but the error persists? In this blog, we’ve given simple solutions for virus definition errors, and here’s the solution for “Virus Definition Failed” in Avast Antivirus.

For Beginners: Avast Antivirus is Avast’s Internet security software for Microsoft Windows, macOS, Android, and iOS. Avast Antivirus offers free and premium versions that include computer protection, browser protection, antivirus software, and spam protection.

What is the reason for the “Virus definitions update failure” problem in Avast Antivirus?

  • The reason why you cannot update Avast virus definitions is that the recent update was installed on an abnormal date. Therefore, even if the update is properly installed on your computer, the virus definition will generate an error.
  • One of the main reasons for this error may be the incorrect installation of Avast. This can happen if the update failed or was canceled during installation.
  • Another reason why Avast virus definitions are not updated is an incompatibility issue. If your Windows is not updated regularly, the new version of Avast may not be compatible with the version of Windows already installed.

The solution to the “Virus definition update failure” problem in Avast Antivirus

Update your Avast to the latest version

One of the easiest solutions is to fix the incompatibility issues that may be causing your Avast problem. So, check for expected updates and install them. You should also update Avast.

  1. Start Avast and go to Menu and Settings.
  2. Under the ‘update interface’, click on the CHECK FOR UPDATES button.
  3. Once the update is complete, check to see if your problem has been resolved.

If no updates are expected, you will need to restore your Avast installation files.

  1. Open the Windows Control Panel (visible by the large icons) and click on Programs and Features.
  2. Click on the application and select Edit.
  3. In the new window, click Restore and wait for Avast to make the necessary changes to the data files to restore the client software.

Reinstalling Avast

If Avast does not update the virus definitions after trying the above method, you can reinstall Avast. To do this, you need to use a professional uninstaller. Or boot your computer in safe mode and perform the uninstall.

  1. Open the Run window, type MSConfig in the text box and click OK.
  2. On the Boot tab, turn on the Safe Boot option and save your changes.
  3. Reboot your computer to enter safe mode.
  4. Run the avastclear.exe file that you downloaded to your computer to remove any remaining files.
  5. Reboot your PC in normal mode and download the latest version of Avast from the official website to install it.
  6. This will remove any corrupted files and eliminate the “Avast does not update virus definitions” error.

Utilize the built-in troubleshooting menu

  1. Open Avast, go to menu and settings.
  2. In the general window, click on Troubleshooting, scroll down and click on CALL REPAIR.
  3. Click Yes and wait for the restore to complete.

Frequently Asked Questions

  1. Start Avast Antivirus and click on the menu icon.
  2. Select Settings.
  3. In the Settings menu, click the General tab.
  4. Select the Update sub-tab.
  5. Click the Check for updates button.
  6. If an update is pending, click the available option to download and install the update.

This problem was caused by some bugs in Avast software that were fixed in Avast version 6.16. This problem was fixed in the latest Avast updates, so you need to install an updated version of Avast software to solve it.

If Avast Antivirus does not update, you need to update it regularly for it to work effectively. Sometimes an unknown error may occur during an Avast update. Incorrect DNS settings or a firewall running on your system can cause these errors.

Right-click on the Avast icon in the notification area of the Windows taskbar and select Update > Virus engine and definitions. If your Avast antivirus does not check for updates automatically, click Check for updates. Wait for Avast scanner to check and install virus definition updates.

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