I dont know what (sp?) means but selecting the right antivirus solution is about the hardest thing people ask me. Every different program has strong and weak points, just like every different person is suseptable to different viruses.
For example - gramma surfing the web is probably only going to get website based viruses, or ones which spread from email attachments - while billy grandson is using bearshare, and limewire and download pron with viruses built in.
Lets say that it just happens that panda av works great for grandma but billy gets viruses every other day with it. While, perhaps Norton workcs for billy but not for grandma. (these are random choices of AV and do not imply that these two specificaly are better int hese cases). I have grown to dislike AVG since sometimes last year - before then it was impressive but just isnt cutting it for me. Sometimes you just have to try different ones and when you find one that works for you stick with it and never let it go (untill the company changes it and its sucks <cough old mcafee vs curent mcafee cough>)
You can surfe the web for free AV like avast and see if its any better but to be honest, I find in the situation of my customers - there really is only two AV that I ever reccomend or put on and those are Norton and Kaperski. if you pull a long straw and norton actually works for you then it usually ends up working flawlessly. However, if you pull the short string you are boned and there is no other way to put it. Luckily for me, i pull the long straw with every one of my personal computers lately - and most of my customers as well. However, I also skip cirtian yeras.
2002 best year ever
2005 ify
2006 no
2007 yes
2008 very unimpressed as of earlier this week.
Also, if you go the norton route, do not get internet security or system works. Only get straight clean antivirus with no other junk in the trunk otherwise you will regret it. Norton also has a bad track record for being installed onto computers which are already infected (in my experiance).
Leately more and more, I have been finding that while norton works most of the time - nobody ever drawn short strings with Kaperski - last comparatives report i read kaperski had the highest catch rate, lowest impast, nearly fasted boot time and least affect on the computer system. It's like win win.