Attached Link: http://www.windowsecurity.com/articles/Protecting-System-Files-UAC-Virtualization-Part1.html

> Quote - Hi its poser &, Vista, but not sure if OS matters really? > here's the history: > > 6) noticed that all old (additional content) folders still showing up in Poser runtime, even though they are *not* there when I check in Explorer!

Well, that looks like you've been bitten by Vista's folder Virtualization (see link).