On both my Acer aspire one netbook (synaptics) and my Lenovo notebook (alps) I need to tab twice on the lower edge of the touchpad (to gain its attention?!?) and then it will scroll. Beyond that I believe you need to take a walk on the Dell support web site. There are number of 14xx models so you need to follow the steps there to find the freshest driver
for your particular model. On both of mine the newest drivers
have given scrolling as well as "pinching" to re-size pages, photos etc.