Haha, finally!!! AVG and Avast guarantees Vista compatible. I used them all already. ZoneAlarm doesn't have Vista support yet, but there is an equivalent Firewall that looks just like ZoneAlarm.
PC Tools Firewall Plus Free Edition 2.0
It does an excellent job on Vista.
Vista is a nice upgrade as long as your sustem meet or exceed system requirements. Better to go above and beyond specs, lol.