I don't want to be one of those guys, that comes in to threadcrap, and not answer the question, but... I would try to dissuade your brother from using those suites, especially on a laptop. They're very bloated, and even good laptops are performance challenged when compared to desktop computers. For a free security setup I'd use:
Antivir antivirus
Windows firewall
SpyBot S&D
Spywareblaster
Windows Defender (if he's in Vista)
That's a pretty lightweight setup, and with common sense should keep him very well protected.
I can't answer the question, but maybe there's a decent writeup of features on AOL and Comcast's page.