I've used avast free with Windows 7 firewall for about a year, but lately I've started to have problems various Windows Firewall extensions (Windows Firewall Control, TinyWall, and Windows Firewall Notifier), so clearly I need to switch to a third party firewall. Comodo Firewall seems to be a popular choice these days so I'll try that. Does it play nice with avast free, or should I just uninstall avast and go with Comodo Internet Security, which also includes their antivirus? I'm looking for a setup that's light on resources. fwiw, I'm also using KeyScrambler.