As of right now it is not supported - installation initializes until it realizes you're not on XP SP2. I heard it was an issue with WMP11? But it does not make much sense - I use the Zune software on my laptop which is using XP SP2 with WMP11. This is a minor setback - I transferred all of my music songs to my desktop running Vista final, only for it to be incapable of syncing my Zune! BUGGER! (did I get that right, brits?) Any information on why they don't support the software?