i have solved my problem steps are

1) u just need to go to this link https://www.dell.com/support/home/in/en/inbsd1?~ck=mn

2) and give your service tag or u can click detect pc

3) your device details including configurations, warranty details, etc will be displayed and then

4) go to diagnostics tab and run the quick test (if u have Support assistant its fine or else it downloads and runs it)  

5)  After the test u will get the details which and all are to be updated or installed u just need to press download and install (in that list there is a driver named chipset which is the driver for human interface(touchpad))

6) it requires a restart and then all the touchpad features work properly

If above steps do not resolve the issue, you may also use the "Get Help Now" option at the bottom right to chat with a Dell technician right away.

 

 

Cheers,

Maruvada. 

1. Ensure your System is up to date using Windows updates
2. Run ePSA diagnostics
3. Open the Device Manager (Windows key + R)
- Left click on “Human Interface devices” and look for “HID-Compliant device” or “Dell Touchpad”. Right click Uninstall
- Close the Device Manager and restart the computer
4. Run Windows updates to see if a Touchpad driver gets installed

To receive assistance from Dell support, click the "Get help now" icon on the right to start a live chat session. Provide to them the private computer Service Tag, your result of the pre-Windows ePSA diagnostics, and all of your troubleshooting.

Where to find your Service Tag