[Wolferz]

I used Mcafee for a short time and found it a bit intrusive when surfing the web. It slowed things down while it sniffed like a dog for anything not on the up and up. Your mileage may vary.
Personally, I use Microsoft Security Essentials. It's free. I hate over priced subscriptions for antivirus software that doesn't always catch what it's supposed to. I picked up a trojan when I used McAfee and didn't find out until my ISP notified me of some excessive traffic coming from my IP addess. BOOT!