Part of this is users' fault. "Critical updates" are called that for a reason, and it's foolish to ignore them
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Microsoft, however, must share blame, too. Windows XP's pop-up invitations to use Windows Update must compete for attention with all of XP's other, less important nags -- get a Passport account, take a tour of XP, hide unused desktop icons, blah, blah, blah.
I also really like the opening paragraph
Between the Blaster worm and the Sobig virus, it's been a long two weeks for Windows users. But nobody with a Mac or a Linux PC has had to lose a moment of sleep over these outbreaks -- just like in earlier "malware" epidemics.