Hi,

As touchpad defaults have already been tried, lets try the following steps to resolve this issue:

Uninstall and re install the touchpad drivers:

• Click on “Start” and right click on “Computer”.
• Click on “Manage”.
• Click on “Device Manager”.
• Under “Mice and other pointing devices”, you will find the touchpad driver listed.
• Right click on it and click on “uninstall”. (Check the driver installed on your system and re-install the touchpad driver from the below steps accordingly).
• Check the box to delete the software.
• Restart your system

Click on the below link:

http://dell.to/TE7Rgx

• Enter the Service Tag of your system or select the system model.
• Select the Operating System and you will find the touchpad driver under “Input”.
• Click on the touchpad driver. (Install the same driver which you uninstalled from “Device Manager”.
• Click on “Download File”.
• Select “For Single File Download via Browser”.
• Click on “Download Now”.
• Save the driver on your desktop.
• Once the driver is saved on desktop, right click on it and select “Run as administrator”.
• Install the touchpad driver by following the on screen instructions.
• Restart your computer.
• Check if the issue is resolved or not.

I am adding you as a friend; please accept my friend request and send me a private message with the system Service Tag so that I can check the system warranty details and help you further.