There can be many issues such as a banged up OS to incorrect drivers and the need for a new user account to test in.
The latest driver may be the wrong driver. Disable any Windows Driver update system and go back to what Dell supplies as a start. Eventually you find yourself doing a factory restore if all else fails.
I have an Inspiron 7720 with an Nvidia GT650M card built in. I went to device driver settings and the card was working fine. However when I go in Nivida Control Panel, and Manage 3D settings, Global settings, I cannot select to use my High performance Nvidia graphics processor I get an error message.
Failed to apply selected settings to your system"