I have a new PC with Vista Home Premium. I use cable internet access.

Vista already has Windows Firewall as part of it. Does that mean I don't need to download an outside one like Zone Alarm which I used on my old PC?

I also used to use AdAware, Spybot S&D and Spyware Blaster, all on advice of the good folks here. Vista has something called Windows Defender, which blocks "malware." Does that replace all or any of those programs?

Thanks in advance.