That PC Pro review is a lot of horsehockey and biased, as that site didn't do a proper review of the program.
Microsoft Windows Live OneCare 2.0 suite - PC Advisor PC World - Microsoft Windows Live OneCare 2.0 Review
I use Live OneCare 2.0 myself, and it's saved my hide on more than one occassion, which is more than I can say for other programs. I also use Spyware Blaster, which immunizes my system. Live OneCare 2.0 is the only commercial program, that will install on my desktop and laptop, and not use a boatload of resources.