1) BlackIce is utterly useless. Read Steve Gibson's page on his Denial of service attacks..
<A target="_blank" HREF=http://grc.com/dos/grcdos.htm>http://grc.com/dos/grcdos.htm</A>
2) Anything by Symantec is highly questionable, and I don't run anything by them. I used to alpha and beta test for Peter Norton, and I saw the quality plummet when they were bought out by Symantec. I finally refused to test for them anymore.. the bugs I'd report would show up in the release versions.. as if I had never reported them.
If, and I repeat IF, there is a conflict between ZoneAlarm and something by Symantec, delete the Symantec crap. ZA works as advertised.
The combination that work well for me:
1) ZoneAlarm
2) AVG 6 anti-virus
3) The Cleaner
4) PestPatrol
5) Ad-Aware
If you are running all of these, you should be pretty safe.
Note: On five machines I installed Norton SystemWorks on, all but one had severe problems with it. The one that didn't had minor problems with it. Just avoid it.. that's my advice.
Bob