Does the average user actually update their PC?

Mike McBride performed some Futher research on the new Microsoft anti-spyware that everyone is talking about lately. His observation was that it covered a lot of what XP Service Pack 2 did because he installed it on Windows 2000. That made me think about all the computers that I work on while I'm moonlighting. Based on the average user, meaning a person who is not very technically savvy, how many computers out there actually have XP SP2 installed? I am constantly installing it for users. I would say 90% of them have it downloaded, but none of them has actually clicked to install it.

This brings me to my point. If Microsoft is smart and they freely give this product to users, maybe, just maybe, we will see a squash put on 85% to 90% of the spyware that is out there. If you rely on the average user to install service packs to fix problems, problems will never get solved. A product like the MS anti-spyware will at least help users find and remove problems prior to installing service packs. Maybe the app should suggest that they install any missing service packs too.