The default Windows Explorer file tool works great! Unless you're shuffling several folders around, that is, since Windows Explorer forces you to open each new destination in a different window. If you're sick of the clutter, give QTTabBar a whirl. This program brings browser-esque tabs (along with an incredibly useful preview pane) to the OS, letting you open several folders in a single window.
The extra menu can feel a bit cramped alongside Windows 8's Ribbon interface, but QTTabBar's functionality is just so great that it's worth the acclimation. Older versions of Windows look less squished, though you may need to hop through some hoops to activate the program.