Maintenance Center (don’t know if that is the correct name in English) suddenly alarmed me that AVAST FREE and Windows Defender were offline without me doing anything. This happened about half an hour after an Avast Update. So my question is, If I install Avast FREE on my Windows 8.1. Laptop do I have to deactivate my Windows Firewall and Defender for comparability reasons? Thanks in advance!
Yes…you do not need Windows Defender (the antivirus part) to be active). But you do need the Windows Firewall to be turned ON unless you have another firewall on your machine.
Your question is a fair question. It should not normally do that.
While it’s possible that you may see a message from the Action Center during an Avast major update, I’ve never seen what you saw as a typical occurrence “out of the blue” (i.e., at any time other than during an actual Avast software update).
Normally you do NOT have to do anything yourself; Windows will automatically switch off it’s anti-malware software when it detects Avast on the job.