The My Book World should come with 5 licenses for the WD Anywhere Backup software. The software activates itself by scanning the network and finding the drive. When it finds the drive, it then unlocks itself. Are you installing the version from the CD? If so, I would recommend that you download and install the latest version of the software from our Product Registration page. If you are using the latest version and still have an issue, make sure that you have any firewalls or security software disabled that may prevent the software from finding the drive. Then reboot the computer and see if it finds the unit. Please see the link below for our Product Registration page.