Backup and recovery shows error occurred during the installation process in Dell XPS L 502X (Windows 7)

I installed Backup-and-Recovery_Application_64M9D_WN32_1.8.1.71_A00 as Dell Datasafe got uninstalled in my machine.

It completed 'Creating the base image' successfully but shows error in 'Preparing Hard Disk' and uninstalls the program. I tried multiple times but gets same error.

I ran this program without connecting external hard disk. Hope I need to connect external hard disk only to create recovery media.

Plz Help !