I believe that you hit the nail on the head,when it comes to internet intrusions by those badies. There is really no fool proof antivirus product on the market today. And I find that the vast amount of ever changing virus infections out there keep security techs on the boarder line of insanity. The old saying is -you pay your buck you take your chances.I try and get my friends to scan every time they go off the internet,and even then that only works if they are willing to do that and refrain from going on those millions of bad sites.