Cool, glad it's working for you. I can't imagine why it wouldn't let you move one of the folders unless it was a security issue with the files or something. Or maybe the files were locked-open by a player app or another explorer window with the preview pane turned on. Who knows? It's Windows, after all, could have just been FM.
There's a chance that you wouldn't even need to move the files anyway. In theory, you should be able to do what you need without moving them at all, since the search results are sortable and the files themselves are "live".