Kaspersky Internet Security 7.0 offers new cutting-edge technologies with integrated solution that protects users from all types of online threats.

The seventh-generation products has a powerful heuristic analyzer that, with the help of the existing proactive defense module, detects and removes unknown malicious programs based on their behavior. The new product also feature an even more user-friend interface and a number of improvements that greatly enhance its functionality and protection capabilities. The new Parental Control module, which includes a linguistic analyzer blacklists forbidden
web addresses, The Privacy Control module, which protects confidential data, prevents the theft of potentially lucrative personal information, including email addresses, passwords, bank details and credit card numbers. 
ftp://kav2006:Fynb02dbhec60@data.kaspersky.ru/7.0.0.125/KIS/English/2007_06_28_12_33/kis7.0.0.125en.exe

im using kaspersky also, i found it as the best as of my opinion. it also windows vista supported.