Based on the thread poster, I agree...I'd say at least 75% of all windows users out there aren't using AV and those that are, I can't tell you how many times I've seen packaged machines that came with a free one-year trial that had expired 2 years prior, etc...or even worse, the DOS command-line AV startup scan that says "Your definitions have been expired for the past 1820 days...". ROFL!

This is the failing line as of this link:

Symantec recommends that users and administrators of all modern flavors of Windows patch their systems and update their virus definitions in concert with some basic security "best practices" outlined in this security bulletin.
They all recommend that users/etc "update" their systems and AV (if they had it). Most have never learned how to update anything...and that's the problem.