Where do you install modules in Drupal? You'd think you install them in the 'modules' folder, but that would not be the proper place. The 'modules' folder (which is located in the root folder of a typical Drupal installation) is where all the Drupal Core modules are installed. These are the modules that Drupal comes with by default. You can put the modules there if you'd like, but if Drupal comes out with an update, you'll have to figure out which modules you installed and which ones are core.