Avast Antivirus: Windows does not detect Avast installation

How to resolve an issue when Windows does not detect Avast Antivirus installation

In some cases, the Action Center or Security Center in Windows reports that an antivirus software is not installed on your PC although Avast Antivirus is installed. If this issue occurs, Windows may display the following notification:

To resolve this issue, refer to the following instructions:

If Windows reports that Avast Antivirus and/or Avast Firewall is turned off, refer to the following article:

Ensure that Avast is installed and turned on

Ensure that the following conditions are met to confirm that Avast is installed and actively protecting your PC:

  1. Avast is installed.
  2. Your Avast subscription is active.
  3. The Avast program version and virus definitions are updated.
  4. Avast reports that You're protected.

For detailed instructions, refer to the following article:

Scan and repair the WMI Repository

The Action Center / Security Center acquires information about the current status of installed antivirus software by using Windows Management Instrumentation (WMI). If there is a problem in the WMI Repository, or the WMI service is not started, the Action Center reports outdated or misleading information. To resolve this issue, scan and repair the WMI Repository by following these steps.

  1. Log into Windows as an administrator and ensure no other programs are running.
  2. Right-click the Windows Start button and select Command Prompt (Admin) from the menu that appears.
  3. Click Yes in the User Account Control dialog, if prompted.
  1. Log into Windows as an administrator and ensure no other programs are running.
  2. Press the Win + X keys simultaneously on your keyboard, then select Command Prompt (Admin) from the menu that appears.
  3. Click Yes in the User Account Control dialog, if prompted.
  1. Log into Windows as an administrator and ensure no other programs are running.
  2. Click the Windows Start button and select All Programs (or Programs) → Accessories.
  3. Right-click Command Prompt and select Run as administrator from the context menu.
  4. Click YesContinue in the User Account Control dialog, if prompted.
  1. Ensure that your Windows XP system has Service Pack 2 or higher installed. To check your current Service Pack version in the System Information utility, follow these steps:
    1. Click the Windows Start button and select All Programs (or Programs) → AccessoriesSystem Tools, then click System Information.
    2. Select System Summary to view your system version, including Service Pack if installed.
    If Service Pack 2 or higher is not installed on your system, refer to the Microsoft Windows documentation for further steps. When you are sure that the latest Service Pack is installed, continue to the steps below.
  2. Log into Windows as an administrator and ensure no other programs are running.
  3. Click the Windows Start button and select All Programs, then select Run....
  4. In the Run dialog, copy and paste the following command:

    rundll32 wbemupgd, UpgradeRepository

    ...and click OK.
    You will not receive a confirmation message, but the results are stored in the setup.log file located in the %windir%\system32\wbem\logs directory, C:\WINDOWS\system32\wbem\logs by default.
  5. Reboot your PC to save the changes.
  1. Type the winmgmt /verifyrepository command into the Command Prompt and press the Enter key to perform a consistency check of the WMI Repository.
    If you receive the error message WMI repository verification failed... ...Access denied when running the above command, repeat steps 1. - 3. listed above.
  2. The message WMI repository is consistent or WMI repository is inconsistent appears in the currently open window. Type the winmgmt /salvagerepository command into the Command Prompt and press the Enter key to rebuild the WMI Repository.
    If you receive the message WMI repository is inconsistent or WMI repository salvage failed, run the command winmgmt /salvagerepository a second time.
  3. After you receive the message WMI repository is consistent in the output, restart your PC.

Once your PC has restarted, the current status of the installed antivirus software is reported correctly in the Action Center.

  • 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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