Hi! Long time since I posted here, so glad this is project is still going strong! To answer your question; yes, you probably should get a copy of Vista to test on as the OS is very flaky and idiosyncratic -- if you want NDN to work properly with it; you can install it in emulators like VMware (it will run show)...
I installed Vista used it for about a week and deleted it; it's very sluggish even when tweakd on state-of-the-art hardware, and the Vista Explorer file manager is a turd to use -- so some Users and Developers that must use Vista might well greatly appreciate NDN's speed, and clean form that follows function design!
Excited to try new version!
:)