That question is put forward often in the CNET Spyware forum. The consensus among many moderators is that the best protection is the user. The antivirus and firewall is just the second line of defense yet today you are finding folk flame about "antivirus didn't protect the PC." Which is true.

About outlook 2003. Install that FIRST and the patches or else you'll lose a lot of time. I learned about it and write about that issue at http://forums.cnet.com/5208-6129_102-0.html?threadID=380443&tag=forums06;forum-threads

After that, install Office 2007 and the word on the street is that Outlook 2003 still works. I don't have any word about BCM.
Bob