That's not true in the majority of cases, although it's possible that our experiences are being distorted by the fact that users don't tend to bring their machines in until they're nearly unusable.

But of those infected systems, we see relatively few that have truly sneaky, invisible-to-the-user malware. Far more that's just a gigantic pain in the ass to remove as it's hooked into everything in order to display ads at the user or rewrite links or shoddy code has destroyed one or more browser or OS components.