:emotion-2:

Please change Operating System to windows 10 in the link below, expand Mouse, Keyboard & Input Devices, and then install touchpad driver. After, install the Video drivers as well.  

Support for Inspiron 3442 | Drivers & downloads | Dell US

and the link below might be of use to you as well.

How to reinstall drivers in the correct order | Dell US

Are your drivers up to date?

But it is saying, "your system doesn't meet the minimum requirements "

You click " Change OS " in link above, and then select either windows 10, 64bits or 32bits - see image below)?  

If yes, please enter the service tag number (or use Detect Product} onto the link below , then download the touchpad and video drivers one at a time.

www.dell.com/.../

i have done all those things but video driver and touchpad driver isn't installing.

If you're able to see the drivers, right click on each one of them and select update. If anyway possible, please provide an image of device manager with Display adapters and Mice and other pointed devices expanded.

Type device manager onto [Cortana] search box, stroll down to Mice And Other Pointing devices and then expand it. Please check and see if Dell touchpad and PS / 2 Compatible Mouse are listed. Expand Display Adapters (Video) as well. Intel HD Graphics and nVIDIA Graphics driver should be listed.  

Dell Inspiron 3543:

Lastly,

Please type Windows Mobility Center onto the search box, and check if touchpad is turn on:

In my device manager there is ' microsoft basic display adapter' in display adapter and 'in mice and other pointing devices there is only ' HID -compliant mouse'

in windows mobility center there is no touchpad option found.