My name is Ipshita and I work for the Social Media and Community Team at Dell..
It can be an issue with the touchpad; you can try the following steps and hope it resolves the issue:
Change the Sensitivity Settings for the Pointing Device from Control panel - Mouse - Device Settings - Dell Touchpad tab.
Since you have already tried downloading the drivers you can. Run custom diagnostics on Dell 32 Bit Diagnostics or on Dell PC Dr using the following steps
Click – Search
Type-Dell Diagnostics Or PC Checkup
Double Click on the PC Checkup: A window will open Choose the Custom Test Option on the Touchpad
In case the Pc checkup is not installed you can install it from the following link
Please respond to the same mail for further assistance