I have Windows, and opening a folder is no longer an option in iTunes. What do I do?

For some reason, iTunes isn't finding my music anymore, so I am trying to get iTunes to realize where my backup music is. I've also tried physically moving all of the songs into the iTunes media folder and telling iTunes to organize it. Because iTunes in the past organized music into individual artist files, it seems the only option is to go into each file folder and open the songs by hand. Can I avoid this?