Avast 2016: Troubleshooting when Avast components malfunction

How to troubleshoot when program features in Avast no longer function

Issue

One or more Avast Antivirus program features (such as Real-time shields, Firewall, or other components) display status as STOPPED and cannot be started manually via the Avast user interface.

Details

This is usually caused by limited or inconsistent permissions to write to disk, system folders, or Windows registry, which prevents Avast Setup from installing, updating, deleting, or overwriting some of its program files and/or registry entries. If any of these files/entries are corrupted or missing, it may result in the malfunction of Avast Antivirus or some of its features.

Solution

Before proceeding with the troubleshooting steps please ensure that you are logged into Windows as a user with administrator permissions, and all other programs in Windows are closed.

  1. Uninstall Avast Antivirus from the system using the Avast Uninstall Utility as described in the following article:
  2. Manually delete any remaining Avast folders in the following default locations:

    64 bit type/version:
    • C:\Program Files (x86)\Avast Software or C:\Program Files (x86)\Alwil Software
    • C:\ProgramData\Avast Software or C:\ProgramData\Alwil Software


    32 bit type/version:
    • C:\Program Files\Avast Software or C:\Program Files\Alwil Software
    • C:\ProgramData\Avast Software or C:\ProgramData\Alwil Software
    Depending on your system preferences, the folders referenced above could be hidden. To display hidden files and folders in Windows 10, visit the following article and click the section entitled Look for the files using Search:
  3. Manually uninstall Avast Firewall Driver (or Avast Firewall NDIS Filter Driver) if it exists in the Properties of your Network connections:
    1. In File Explorer, right-click the Network icon on the left pane, and select Properties from the context menu to open Network and Sharing Center.
    2. In Network and Sharing Center, click Change adapter settings in the left pane to open Network connections.
    3. In Network connections, right-click one of your connection icons (for example, Local Area Connection) and select Properties from the context menu.
  4. Reboot your computer and start Windows in Safe Mode by following the instructions on the Microsoft website:
  5. In Windows safe mode, search and delete all files starting with aswNdis*.* if any exist in the following folder and its subfolders:
    • C:\Windows\System32\DriverStore
  6. If Windows (started in Safe Mode) refuses to delete any of these files, you can take ownership of the files:
    1. In File Explorer, right-click the file that you want to take ownership of, and then click Properties from the context menu.
    2. Click the Security tab, and then click Advanced.
    3. Next to Owner on the top click Change (if prompted by the User Account Control dialog for permission click Yes).
    4. Type Administrator or Administrators into the field entitled "Enter the object name to select", click Check Names to verify, and then click OK repeatedly to confirm changes until all opened dialogs are closed.
  7. Clear all off-line content and cookies from your web browser by following the instructions available on its vendor's website:
  8. Temporarily turn off any firewall software. If you are using Windows Firewall please follow the instructions on the Microsoft website:
  9. Download and install the latest version of Avast Antivirus. For detailed installation instructions, please read the following article:
  10. Insert your license into Avast Antivirus. For detailed instructions about activating your subscription, please read the following article:
  11. If you don't have Avast Premier or Avast Internet Security which include a built-in firewall, turn on your firewall software. For more instructions on how to turn on your firewall, please refer to its vendor documentation. If you are using Windows Firewall please follow the instructions on the Microsoft website:
  1. Uninstall Avast Antivirus from the system using the Avast Uninstall Utility as described in the following article:
  2. Manually delete any remaining Avast folders in the following default locations:

    64 bit type/version:
    • C:\Program Files (x86)\Avast Software or C:\Program Files (x86)\Alwil Software
    • C:\ProgramData\Avast Software or C:\ProgramData\Alwil Software


    32 bit type/version:
    • C:\Program Files\Avast Software or C:\Program Files\Alwil Software
    • C:\ProgramData\Avast Software or C:\ProgramData\Alwil Software
    Depending on your system preferences, the folders referenced above could be hidden. To display hidden files and folders in Windows 8, visit the following article and scroll down to the section entitled Change the view:
  3. Manually uninstall Avast Firewall Driver (or Avast Firewall NDIS Filter Driver) if it exists in the Properties of your Network connections:
    1. In File Explorer, right-click the Network icon on the left pane, and select Properties from the context menu to open Network and Sharing Center.
    2. In Network and Sharing Center, click Change adapter settings in the left pane to open Network connections.
    3. In Network connections, right-click one of your connection icons (for example, Local Area Connection) and select Properties from the context menu.
  4. Reboot your computer and start Windows in Safe Mode by following the instructions on the Microsoft website:
  5. In Windows safe mode, search and delete all files starting with aswNdis*.* if any exist in the following folder and its subfolders:
    • C:\Windows\System32\DriverStore
  6. If Windows (started in Safe Mode) refuses to delete any of these files, you can take ownership of the files:
    1. In File Explorer, right-click the file that you want to take ownership of, and then click Properties from the context menu.
    2. Click the Security tab, and then click Advanced.
    3. Next to Owner on the top click Change (if prompted by the User Account Control dialog for permission click Yes).
    4. Type Administrator, or Administrators, into the field entitled "Enter the object name to select", click Check Names to verify, and click OK repeatedly to confirm changes, until all opened dialogs are closed.
  7. Clear all off-line content and cookies from your web browser by following the instructions available on its vendor's website:
  8. Temporarily turn off any firewall software. If you are using Windows Firewall please follow the instructions on the Microsoft website:
  9. Download and install the latest version of Avast Antivirus. For detailed installation instructions, please read the following article:
  10. Insert your license to Avast Antivirus. For detailed instructions about how to activate your subscription, please read the following article:
  11. If you don't have Avast Premier or Avast Internet Security which include a built-in firewall, turn on your firewall software. For more instructions on how to turn on your firewall, please refer to its vendor documentation. If you are using Windows Firewall please follow the instructions on the Microsoft website:
  1. Uninstall Avast Antivirus from the system using the Avast Uninstall Utility as described in the following article:
  2. Manually delete any remaining Avast folders in the following default locations:

    64 bit type/version:
    • C:\Program Files (x86)\Avast Software or C:\Program Files (x86)\Alwil Software
    • C:\ProgramData\Avast Software or C:\ProgramData\Alwil Software


    32 bit type/version:
    • C:\Program Files\Avast Software or C:\Program Files\Alwil Software
    • C:\ProgramData\Avast Software or C:\ProgramData\Alwil Software
    Depending on your system preferences, the folders referenced above could be hidden. To display hidden files and folders in Windows 7, follow the instructions on the Microsoft website:
  3. Manually uninstall Avast Firewall Driver (or Avast Firewall NDIS Filter Driver) if it exists in the Properties of your Network connections:
    1. In File Explorer, right-click the Network icon on the left pane, and select Properties from the context menu to open Network and Sharing Center.
    2. In Network and Sharing Center, click Change adapter settings in the left pane to open Network connections.
    3. In Network connections, right-click one of your connection icons (for example, Local Area Connection) and select Properties from the context menu.
  4. Reboot your computer and start Windows in Safe Mode by following the instructions on the Microsoft website:
  5. In Windows safe mode:

    Search and delete all files starting with aswNdis*.* if any exist in the following folder and its subfolders:

    • C:\Windows\System32\DriverStore

    Search and rename the file INFCACHE.1 to INFCACHE.1.BAK if it exists in the following default folders:

    • C:\Windows\System32\DriverStore
    • C:\Windows\Inf
  6. If Windows (started in Safe Mode) refuses to delete any of these files, you can take ownership of the files:
    1. In File Explorer, right-click the file that you want to take ownership of, and then click Properties from the context menu.
    2. Click the Security tab, and then click Advanced.
    3. Click the Owner tab, and then click Edit (click Yes if prompted by User Account Control dialog for permissions).
    4. Below the "Name" in the list, click Administrator, or click the Administrators group, and click OK repeatedly to confirm changes until all opened dialogs are closed.
  7. Clear all off-line content and cookies from your web browser by following the instructions available on its vendor's website:
  8. Temporarily turn off any firewall software. If you are using Windows Firewall please follow the instructions on the Microsoft website: Turn Windows Firewall on or off
  9. Download and install the latest version of Avast Antivirus. For detailed installation instructions, please read the following article:
  10. Insert your license to Avast Antivirus. For detailed instructions about how to activate your subscription, please read the following article:
  11. If you don't have Avast Premier or Avast Internet Security which include a built-in firewall, turn on your firewall software. For more instructions on how to turn on your firewall, please refer to its vendor documentation. If you are using Windows Firewall please follow the instructions on the Microsoft website:
  1. Uninstall Avast Antivirus from the system using the Avast Uninstall Utility as described in the following article:
  2. Manually delete any remaining Avast folders in the following default locations:

    64 bit type/version:
    • C:\Program Files (x86)\Avast Software or C:\Program Files (x86)\Alwil Software
    • C:\ProgramData\Avast Software or C:\ProgramData\Alwil Software


    32 bit type/version:
    • C:\Program Files\Avast Software or C:\Program Files\Alwil Software
    • C:\ProgramData\Avast Software or C:\ProgramData\Alwil Software
    Depending on your system preferences, the folders referenced above could be hidden. To display hidden files and folders in Windows Vista, follow the instructions on the Microsoft website:
  3. Manually uninstall Avast Firewall Driver (or Avast Firewall NDIS Filter Driver) if it exists in the Properties of your Network connections:
    1. In File Explorer, right-click the Network icon on the left pane, and select Properties from the context menu to open Network and Sharing Center.
    2. In Network and Sharing Center, click Manage network connections in the left pane to open Network connections.
    3. In Network connections, right-click one of your connection icons (for example, Local Area Connection) and select Properties from the context menu.
  4. Reboot your computer and start Windows in Safe Mode by following the instructions on the Microsoft website:
  5. In Windows safe mode:

    Search and delete all files starting with aswNdis*.* if any exist in the following folder and its subfolders:

    • C:\Windows\System32\DriverStore

    Search and rename the file INFCACHE.1 to INFCACHE.1.BAK if it exists in the following default folders:

    • C:\Windows\System32\DriverStore
    • C:\Windows\Inf
  6. If Windows (started in Safe Mode) refuses to delete any of these files, you can take ownership of the files:
    1. In File Explorer, right-click the file that you want to take ownership of, and click Properties from the context menu.
    2. Click the Security tab and then click Advanced.
    3. Click Owner. Below the "Name" in the list click Administrator or the Administrators group, and click OK repeatedly to confirm changes until all opened dialogs are closed (click Continue if prompted by User Account Control dialog for permissions).
  7. Clear all off-line content and cookies from your web browser by following the instructions available on its vendor's website:
  8. Temporarily turn off any firewall software. If you are using Windows Firewall please follow the instructions on the Microsoft website:
  9. Download and install the latest version of Avast Antivirus. For detailed installation instructions, please read the following article:
  10. Insert your license into Avast Antivirus. For detailed instructions about how to activate your subscription, please read the following article:
  11. If you don't have Avast Premier or Avast Internet Security which include a built-in firewall, turn on your firewall software. For more instructions on how to turn on your firewall, please refer to its vendor documentation. If you are using Windows Firewall please follow the instructions on the Microsoft website:
  1. Uninstall Avast Antivirus from the system using the Avast Uninstall Utility as described in the following article:
  2. Manually delete any remaining Avast folders in the following default locations:

    32 bit type/version:
    • C:\Program Files\Avast Software or C:\Program Files\Alwil Software
    • C:\Documents and Settings\All Users\Application Data\Avast Software

      or

      C:\Documents and Settings\All Users\Application Data\Alwil Software
    Depending on your system preferences, the folders referenced above could be hidden. To display hidden files and folders in Windows XP, follow the instructions on the Microsoft website:
  3. Manually uninstall Avast Firewall Driver (or Avast Firewall NDIS Filter Driver) if it exists in the Properties of your Network connections:
    1. In Windows Explorer, right-click the My Network Places icon in the left pane, and select Properties from the context menu to open Network connections.
    2. In Network connections, right-click one of your connection icons (for example, Local Area Connection) and select Properties from the context menu.
  4. Reboot your computer and start Windows in Safe Mode by following the instructions on the Microsoft website:
  5. Search and rename the file INFCACHE.1 to INFCACHE.1.BAK if it exists in the following default folders:
    • C:\Windows\System32\DriverStore
    • C:\Windows\Inf
  6. If Windows (started in Safe Mode) refuses to delete any of these files, you can take ownership of the files:
    1. In Windows Explorer, right-click the file that you want to take ownership of, and then click Properties from the context menu.
    2. Click the Security tab, and then click the Advanced button (if prompted by the Security message for permission click OK).
    3. Click Owner. Below the "Name" in the list, click Administrator, or click the Administrators group, and then click OK repeatedly to confirm changes until all opened dialogs are closed.
  7. Clear all off-line content and cookies from your web browser by following the instructions available on its vendor's website:
  8. Temporarily turn off any firewall software. If you are using Windows Firewall please follow the instructions on the Microsoft website: Turn Windows Firewall on or off
  9. Download and install the latest version of Avast Antivirus. For detailed installation instructions, please read the following article:
  10. Insert your license into Avast Antivirus. For detailed instructions about how to activate your subscription, please read the following article:
  11. If you don't have Avast Premier or Avast Internet Security which include a built-in firewall, turn on your firewall software. For more instructions on how to turn on your firewall, please refer to its vendor documentation. If you are using Windows Firewall please follow the instructions on the Microsoft website:
  • Avast Premier 2016
  • Avast Internet Security 2016
  • Avast Pro Antivirus 2016
  • Avast Free Antivirus 2016
  • 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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