Hello Barrie Sambrook,
I understand you are having problem with using our driver in your Dell system.
Based on your description, your system has switchable graphics. This is means it has the Intel® HD Graphic controller and the Nvidia video card.
Since this is a special configuration, your system needs special software and drivers. I am afraid to tell that the drivers for this specific system need to be provided by the system manufacturer. We offer generic drivers for your system but as mentioned before, your computer requires special driver.
Since you have tested the latest generic drivers from our side, you may try another generic driver version from our side by accessing to the following link:
The other option would be to wait until the manufacturer of the computer release a driver for your system.
Thanks