How can I get my iTunes library back into iTunes?

Folks:

Hi and thanks for the assist. I recently had to reinstall everything on my Dell XPS 8700 running Windows 7 Pro. I downloaded and installed iTunes 11 and then made my default Media Folder location where all my iTunes music is (backed up). However, while I assumed (yes, I know the old axiom) iTunes would simply automatically import everything in that folder back into my new install, nothing imported. How can I get iTunes to import media (songs, movies, etc.) from my previously saved folder (there doesn't seem to be an "Add Folder" option anywhere - and I really don't care to individually add every single song...

Thanks again.

Tom