Well Andrew Grygus has been predicting for a while that by the end of this year Windows will be pretty much unusable online. Some of the scumware infestations that he has described removing sound scary.
I'm thinking in particular of the one described at [link|http://z.iwethey.org/forums/render/content/show?contentid=198346|http://z.iwethey.org...?contentid=198346].
Cheers,
Ben