The headlines scream that figure out.
Microsoft scanned 270 million PCs from January 2005 thru March 2006 and found malicious software on 5.7 million of them.
Now, I am not a rocket scientist, actually, I am, but my math, being fuzzy after all these years in IT does not compute that to be 60%.
However, that is a whole lot of PCs carrying a malicious payload.
Trip this: some of those same PCs were re-infected with completely new malware after an initial disinfection, some many more times.
Reminds me of a couple of old saws from back in Nigeria, one of them from Uromi: a dog which runs out into the street without heeding its owner’s calls is looking to get hit by a car; and a Yoruba saying: the person looking to die generally finds someone looking to kill him/her.
Moral: no matter what you do, or what OS is in place, some ‘Net users will always be victimized as a result of their stupidity!