No, Dreamscene was a great concept in theory, but in the real world, it was pretty much a flop, to some degree.
Only available to Ultimate users at first then later to Vista Home Premium, only through stardock.
But, required a lot of CPU and RAM cycles for some dreamscenes.
Not all PC's that were sold with Vista could handle it.
Not all Scenes were free, and some caused problems.
Plus there was some interest, but not enough, and I think Stardock (or MS) didn't want to mess with the licensing.
Who knows. But it has been removed.
Use the hack to put it back in.