Sorry to hear about your ZA and not being able to fix it. Have you tried asking tech support at ZA ??? Anyhow, their are lots of firewalls to choose from. Their is a forum on here just to talk about...

That's why I suggested to you that something HAS changed recently. It could be an app you recently installed, or a windows update, or you changed a setting on your ZA app, .......something has...

Also if it is turn on in msconfig then you got some kind of conflict with one of your apps somewhere, you said it was running fine after you upgraded to win10, ok, did you change something, or add...

Sorry my mistake it should be under Services......

Check msconfig just type that in search, then your boot menu should pop up, under devices, just checked to see if it is turn off, or their is a check mark next to it, showing its on....just an idea.