They must be the sort of people who believe you when you say 'gullible' has been removed from the dictionary, who persist in using Outlook (and IE) because they can't conceive of a different program for email (or web browsing), and tend to follow dodgy links and load suspect attachments in their email no matter how many times you tell them not to. Or am I tarring too many with that brush?
I know people can learn - my sister got hit (we don't know what it was) with something some years ago and lost a lot of irreplacable files. Now she uses Opera for browsing and Eudora for email and runs AVG. My brother also learnt not to ask for help with his PC if he won't listen to my recommendations, though that incident wasn't virus-related.
Interestingly, there's an argument brewing over Linux vs Windows in a mailing list I'm on that's dedicated to Ensoniq's samplers. One of the "points of comparison" was anti-virus software. Another was pirated software, which is slightly ironic given that anyone who's selling copies of the old Ensoniq OS diskettes is technically pirating it (which has been noted on-list already).
Wade.