I think you mean Kaspersky Internet Security because Kaspersky Anti-virus, as stated, is an ANTI-VIRUS. Whichever you mean, I haven't used none of them (as in paid for one), but I have tried a demo of the paid version of Kaspersky Anti-virus, which I have used to clean my computer. It was very good.
Zone Alarm is only a firewall
(which is a quite good two way firewall)
As for Internet Security 7 (3 User Edition) here is its 'Product Features'
Includes Kaspersky Anti-Virus 7.0
Defends Against Internet Fraud
Protects From Online Identity Theft
Keeps Your Children Safe Online
Provides Personal Data Protection
Comprehensive Protection From: Viruses, Trojans & Worms/Spyware, Backdoors & Other Crimeware/Keyloggers, Rootkits, Phishing & Spam/Hacker Attacks (Two-Way Firewall
Triple Protection: Highest Detection Rates/Fastest Response To New Threats With Hourly Updates/Proactive Protection From New, Unknown Threats
Free Technical Support
And here is one Online Review you might like to check:http://www.pcadvisor.co.uk/reviews/index.cfm?reviewid=1008As a note, many experts say there's none (whether paid for or free) which can provide 100% Protection.
Edited by Juha, 31 March 2008 - 07:07 PM.