Hi akanksha26,
You may uninstall and reinstall the touchpad driver. Please follow the steps below:
- Press ‘Windows’ key + R on ‘Desktop’ screen
- Type ‘devmgmt.msc’ in run box and press ‘Enter’
- Click > sign next to ‘Mice and Other pointing Device’
- Right click the entry listed under ‘Mice and Other pointing Device’ and click ‘Uninstall’
- Click ‘Yes’ on the security warning
To reinstall the driver, you may refer to the link: http://dell.to/14BFyGH.
Keep me posted with the information. I will be glad to assist further.