What seems like a simple thing may not be so.
This happened to me, and the whole process got so frustrating that I decided it warranted a post, so I could help you folks too.
For some reason, my Windows system got reset and I started experiencing erratic behavior whenever I typed, and I realized it was because my Dell Touchpad settings went back to the default (I normally disable the pad selection and the pad click).
But a search in Google gave me links that mentioned a Dell Touchpad tab in my mouse settings in the control panel (in windows 7) and I had none.
I then went to c:\program files and located the Dell folder, which in my case was “DellTPad”. I ran the touchpad exe, which for me was DellTPad.exe, and it started the touchpad settings application, and I was able to set my settings again.
I run Windows 7 on a Latitude e6510, but this method of mine should work on many Windows versions and on many Dell computer models.
You can first go to Control panel >Mouse.
If that has no Dell Touchpad tab, then go to File Explorer, and navigate to C:\Program Files\DellTPad. once there, run delltpad.exe and set your settings for the touchpad.