Those changes are made by the third-party theme you have installed. Go to the website where you downloaded said theme, and you may find a utility and/or instructions on how to change it or create your own.
One other thing, isn't it harder to use Windows Explorer when it's using Aero Glass across the entire window? I've never really understood why people take a perfectly good product and [INSERT COLORFUL EXPLETIVE HERE] rendering it almost unusable....