Default Company Image
Read this tutorial for an explanation of entities. That tutorial will help explain the meaning of the “Entity Reference” name.
Problems with Installing Modules
If you have problems with instaling modules, Drupal.org has some ideas of alternate installation methods: https://drupal.org/node/895232
One common solution is enter your FTP details in your Drupal site’s administration area.
Another solution is upload the module files manually, not using your Drupal site’s administration area.
Both of those solution are explained via the link above.