The worst virus anyone can get on their pc is called... Norton...
Don't know if I can agree with that. It performs at the top, lowest ranking in any category is good and does excellent in a number of categories including fending off root kits. It's big drawbacks in my opinion from 3.5 years of experience with 2005, 2006, 2007, and now 2008 are: big footprint, active antivirus has to be shutdown to play some games (performance hit) and it's a b*$&!ch to deinstall and get working again. I would not recommend this product for dialup users. It had a habit of wanting to update itself during MS monthly update cycle. My dialup and system became unusable for hours getting "critical" security updates from both Symantec and MS.
It's big postives, again in my opinion from actual use, is it has performed well in dealing with viruses, trojans, spyware and you name it. One infection from a new outbreak virus and backdoor trojan combo (I forget the name now) which it found and quarantined for me during this entire time. Everything else has not landed on my system. And, of course, I don't install plugins and addons, unless I really want them and I know where they are from.
Enough from me for now. Later.