Firewall in Windows 8 - won't turn on.

I’m having issues with my laptop running Windows 8. I’ve disabled the Windows firewall, done a repair/restart, and uninstall/install and I can’t get the Avast firewall to turn on. It appears to be downloading the dat files and running the scans with no problem. Not sure what the issue is. Any help would be appreciated.

did you just install avast?
did you remove your previous used AV before installing avast?

General: Uninstalling a third-party antivirus software http://www.avast.com/en-eu/faq.php?article=AVKB11#artTitle