"Anybody with the privilege to run infected software on unprotected machines deserves to have their Internet cut to protect the Internet and the more responsible users of it."
When you install Windows XP, you're automagically given the status of Computer Administrator. It might seem trivial to us IT types to go and swap the account type, but to someone who's just about capable of sending a few emails, using the basics of Word and Excel, surfing the web for pr0n and watching funny videos on youtube/facebook etc (ie the vast vast majority of Windows users) it's above their level of understanding.
The problem is that when they click a dodgy link to an infected site, they don't realise that they're installing stuff. This is one thing that Vista addressed with the UAC prompts... And everyone complained that it was intrusive and turned it off (although how this is different from having to enter your su password with sudo in Linux I don't know)
It's very simple for people like us who deal with IT and these issues on a weekly/daily/hourly basis to say "Don't click this, don't press that and for God's sake don't type this" but for your average homeuser who has AVG and ZoneAlarm installed and still can't work out why their computer's grinding to a halt it's no good.
We need education - and this needs to stem from both the classrooms (I've worked in a school as IT Support and when the IT Teachers can't figure out to plug the USB printer back in to get it to work there's obviously issues) and from industry (get all your staff who use the internet on SOME sort of IT Training course)
Perhaps el Reg or someone could do a beginners guide to protecting your PC that we can forward to all our family and friends and maybe claw back some of our evenings and weekends. Something in the vein of Idiots Guide or something... I would - but I'm not a technical writer with a sense of humour ;-)
(And yeah, I know Ubuntu is *almost* ready for the average home user... *almost* but it's not quite there yet... And I just take offence at Macs for personal and historic reasons... ;-))