Since I started this thread with the purpose of illustrating the need for virus protection, I would like to make a few comments.  First I would say I prefer facts to opinions were they are available.  I have detected five viruses since 1996.  I have had broadband access to the Internet since Oct 1999.  I have never used a software firewall.  For the past four months I have had a limited hardware firewall, which is built into the Linksys WRT54G router.  My PC was last booted on the 19th of April 2005 at midnight.  Since then ccApp.exe, ccEvtMgr, and ccSetMgr.exe have used only eighteen seconds of CPU time.  Rtvscan has used twelve hours, forty minutes and fifty-seven seconds.  However all of Rtvscan.exe measurable time occurs during the nightly full scan, while I am asleep.  Total memory used by the four processes during the day is less than twenty megabytes.  During the same time the System Idle Processes accumulated slightly more than seven hundred three hours of CUP time.  Using these facts I am unable to see have my AV software can be considered resource intensive, except during nightly scans.  I also run, when I remember Ad-Aware SE and Spybot S & D.  I find both of limited use.  I have been running Microsoft/Giant beta which is nice since I am able to run it a set and forget mode.  P.S. The times make no sense unless I mention I have dual processors on my PC.