Home » Alerts » How to Fix Avast Antivirus Compatibility Issues with Windows 8 / 8.1

Officially Avast Antivirus is compatible with Windows 8/8.1. But some of the users are facing problems while running Avast on their latest versions of Windows Operating Systems. This document is written about those issues and solutions.

Here the issues covered:

  • Action Center Pop-ups
  • Blank/Black Screen
  • Impossible Avast Uninstall
  • ‘Process Trust’ Error during the installation.

As a good piece of advice to you is, keep Windows and Avast antivirus updates to the latest versions to avoid any compatibility issues.

Issue 1) – Windows Action Center Says Avast Antivirus is Turned Off

Apparently, it seems a very common and frequent issue. Windows 8/8.1 Action Center displays either of the following two messages: ‘Check virus protection (important),’ ‘Windows Defender and Avast Antivirus are both turned off,’ or ‘Windows did not find an antivirus program’. Fortunately, it’s very easy to fix this issue.

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Windows Action Center Messages saying Avast Antivirus is Turned Off

Solution a) – Just turns off (pause) your Avast antivirus application, and re-enables it after 10 minutes:

Find the orange color Avast Antivirus icon in the system tray (which is usually hidden, so tyo unhide it, click on the top arrow).

Right click on it and go to ‘Avast shields control’, select ‘Disable for 10 minutes’, and confirm.

Repeat the same process again to enable it again after 10 minutes. At the place of ‘Disable for 10 minutes’, now select the option ‘Enable all shields.’

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Solution b) – Let Windows Action Center to turn on and update Avast antivirus:

  • Click on the ‘Open Action Center’ link to open the Windows Action Center or to open the pop-up message.
  • Select ‘Turn on and update Avast Antivirus’ and Windows should start automatically updating your Avast Antivirus into the latest version.

Solution c) – Following these steps to Reset Windows Action Center repository:

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  • Open the Command Prompt as Administrator (move the mouse to the bottom-left corner, wait until the box displays, right-click on it, and choose Command Prompt (Admin)).
  • Type ‘winmgmt /verifyrepository’ in the Command Prompt and press Enter.
  • If you get ‘WMI repository is consistent -no problems detected,’ type ‘winmgmt /resetrepository’ and press Enter.
  • If you get ‘WMI repository is inconsistent -problems detected,’ type ‘winmgmt /salvagerepository’ and press Enter.
  • If you get ‘WMI repository has been salvaged – WMI repository has been successfully rebuilt,’ continue to the last step.
  • Restart your computer.

Issue 2) – Windows Won’t Start and Displays only a Blank/Black Screen

This issue is extremely annoying issue as it doesn’t let your Windows start and display a blank/black screen only. Users reported that they face this issue after they installed Avast Antivirus on their computer.

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Solution a) – Follow below written steps to fix the blank/black screen issue:

  • Press ‘CTRL’ + ‘ALT’ + ‘Delete’ simultaneously, or ‘CTRL’ + ‘Shift’ + ‘Esc’ on your keyboard to open the Task Manager.
  • Once the Task Manager appears, click on ‘More details,’ then ‘Startup,’ right-click ‘Avast Antivirus,’then ‘Open file location.’
  • In the opened folder, search a file called ‘AvastUI’ and double click on it.
  • Now the Avast user interface should open, find the tab labeled ‘SECURITY’ » ‘ANTIVIRUS’ » ‘Behavior Shield,’ and find ‘Settings’ in the top-right corner of the ‘Behavior Shield’ window.
  • When the Behavior Shield settings open, it shows the option ‘Monitor the system for unauthorized modifications’, uncheck it.
  • Then go to the second settings tab, called ‘Trusted processes,’ add ‘C:\Windows\Explorer.exe,’ and ‘C:\Windows\ImmersiveControlPanel\SystemSettings.exe,’ and then click ‘OK.’
  • Restart your computer and Windows should now start smoothly without any issues.

Issue 3) – Windows Keeps Saying to Uninstall Avast Antivirus but even if it’s Already Uninstalled

In some cases, Windows can’t recognize the program correctly and reflects the message that Avast Antivirus may not be recognized by Windows even if you perform a successful uninstallation of it. If you are facing this problem issue, try one of these steps:

Solution a) –Use the Avast Uninstall Utility to uninstall Avast antivirus.

Solution b) – Search for ‘avast’ using the Windows search and backup to find all Avast files, then delete all ‘avast’ files found.

Issue 4) – ‘Process Trust’ Error During Avast Antivirus Installation

This issue occurs when you are trying to install Avast Antivirus on your systemrunning Windows 8.1, and you receive the ‘Process Trust’ fatal error pop-up message saying ‘Avast doesn’t trust Avast Installer,’ and due to this reason the process gets disabled. You’ll face this error if you have some other security software installed on your system.

Solution a) – First of all disable/uninstall any earlier installed security/anti-malware software and then, try to run the installer again.

Solution b) – If you have previously installed Avast software, uninstall it using the Avast Uninstall Utility then install it again.