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Please click on the below link and chose your operating system and go to security .
Install the control vault drivers and during installation follow the onscreen instructions which will guide you to register the finger scans. http://www.dell.com/support/home/us/en/19/product-support/product/latitude-e7470-ultrabook/drivers
and the below is the guide on the instructions.
I tried to apply these steps. After installing control vault, I was requested to reboot. And now what...? The steps and file links just don't explain at all how to proceed further. Very frustrating...
Another very frustrating thing is the impossibility to search for a specific software on the dell download pages. You have to open all the categories one after the other...