Both of the articles I found were mis-understanding the Microsoft Report... and the authors assumed the 5.7 million computers were a statistical sample of the total population and based their stories on that mistake.
One even had the headline "Microsoft's Malware Report: 60 Percent of PCs Infected" which I posted in FR! Even more embarassing is that headline comes from the supposedly pro-PC TechNewsWorld.com. They were ready to believe it.
Sometimes perception is more telling than fact.
I guess so :~)