Straightforward Firewall Not working

[Dreadnought84]

Hello,

I have the Avast Internet Security product for which I am subscribed to until October 2014. My question is straight-forward:

On the "Status" part of the GUI it shows that the firewall is turned off. Ok, easy, I click "turn on" and it says "Unable to start firewall!" Help?

[Pondus]

Was your previous used AV removed before installing avast?......and did you run that vendors removal tool

Have you tried avast repair?
Controlpanel > ad/remove programs > avast > uninstall/change > repair option.....

[Alikhan]

If what Pondus said does not work:

Do you have any security related applications installed?

Disable Windows Defender too before installing avast!.

This should fix it... Use the installer I linked not an old one and run it from desktop

1. Download Avastclear, Rejzors uninstall tool and the appropriate Avast program edition

Note: It's important you used the stub online installer from the one I linked.. NOT the offline one.

Note: You need to be ONLINE during this install (online installer works in all cases whereas offline sometimes doesn't)

http://files.avast.com/iavs9x/avast_free_antivirus_setup_online.exe
http://files.avast.com/iavs9x/avast_pro_antivirus_setup_online.exe
http://files.avast.com/iavs9x/avast_internet_security_setup_online.exe
http://files.avast.com/iavs9x/avast_premier_antivirus_setup_online.exe

Avastclear : http://files.avast.com/iavs9x/avastclear.exe
Rejzors Uninstall tool: http://rejzor.wordpress.com/avast-cleanup-tool/

2. Uninstall Avast by control panel  [If you don't have Avast in control Panel go to #4]
3. Uninstall in safe mode using Avastclear.
4. Run Rejzors Uninstall Utility in Normal Mode (removes traces avastclear doesn't) - reboot.
Check : Once uninstalled check in device manager>view>show hidden devices if there is anything related to avast with a yellow triangle.. if so, uninstall it and reboot.
5. Install the version you downloaded.
6. Reboot.