Even if you didn't get to activate the pre-install security tools, you need to (must) uninstall AND run the respective removal utilities (use the link).
About Windows Firewall and Defender, AIS can work with both. I'm not getting into the discussion about if they are useful or not. I'm just pointing out that there is no problem in having AIS and Windows Firewall and Defender all active.
After installing AIS, you might want to review all firewall rules (of all firewalls installed (whether enabled or disabled) and delete the old rules. Old rules might seem to be correct, but updating programs can cause them to start blocking them. So by deleting the old relevant rules, the new ones are re-created. Note: you don't need to delete each and every old firewall rule; just the ones that are relevant to programs not working / not connecting as they should.