I have Countryside Computer Care in my home town. I get computers brought in all the time with McAfee and Norton on them that have infections. (With all the stuff going on with Mr. McAfee I couldn't support his product anyway.) I recently had a PC that was giving the ol' BSOD (blue screen of death.) Guess what was causing it....McAfee! Removed McAfee in safe mode....booted fine. McAfee and Norton literally find their way into every nook and cranny of your PC...they're way too heavy and invasive in my opinion. I use AVAST on my personal PCs (including the one I use for work), and if a customer needs anti-virus I will install AVAST free. I don't charge for AVAST, but I do it during a computer clean up job. Infections will get past AVAST, Norton and McAfee....so what's the difference? With AVAST free you're not out $60-$70 a year. I really like the boot time scan which scans the hard drive in a pre-Windows environment. AVAST also has a browser add-on which helps while surfing. I suggest using AVAST free, using wise internet habits, and knowing the tricks of dealing with an infected PC.