Can't find compatible hardware (NVIDIA)

There are a couple of possibilities:

First, this system was sold in multiple versions, with several video options.  The base model had only Intel graphics, so if that's what you have, it is the reason you're not seeing nVidia hardware in it.  Look up the original specifications by service tag at dell.com/support.

If the system once had an nVidia GPU but that doesn't show in the device manager any longer, it is very possible the GPU has failed - - the system is over ten years old, so that wouldn't be surprising.

Is there one or are there two entries for the GPU under the Display Adapters settings in the device manager?

@ejn63​ it had a gpu  and i was using it until yesterday when i accidentally uninstalled it. It was preventing a software i was using from running smoothly. So i uninstalled it in a bid to do an update. I saw an instruction from a web site that instructed to enable hidden device in device manager then uninstall the nvidia so i can install the update. Since then it has been a nightmare, no presence of NVIDIA gpu again. Now some of my programs cant work because they are tied to hardware acceleration with the Nvidia GPU.

Reset the system:

Unplug, disconnect the battery from the system board and hold the power button for 30 sec.

Reconnect the battery and boot the system.  Do you see two entries in the display adapter panel in the device manager?

If yes, try reinstalling the driver for the nVidia GPU (you may need to use the nVidia one if you're running Windows 10, which Dell likely doesn't have a driver for).

If no, the trouble with the application running when the nVidia driver was in place is likely a warning that the GPU has failed, which isn't that unexpected given the advanced age of the system.  Whether you want to spend the cost of a replacement board on a system that's about eleven years old is a question only you can answer.