Norton and McAfee are memory hogs, I've never liked them since the time I tried them out a year ago. I am a guy who goes through many anti-malware programs all the time and tries to stay up to date with whats staying on the top. Are you wanting a AV program that costs money or a free program? Free I would recommend Avast. If you are going to pay for one I'd go with Zonealarm security suite. I have been using Zonealarm for quite a while now, it has anti-virus, anti-spyware and everything built in as well as a firewall. My computer hasn't had any nasty infections in a year or so. I personally think Zonealarm is easy to setup to update and get everything going smooth, it doesn't bog my computer down much at all.