Since you are posting in the laptop forums, I assume that you have one.
Can you plug in a USB mouse and will it move the cursor?
By any chance have you disabled the touchpad. Here is what my touchpad software looks like. Yours may look different but the idea is the same.
Thanks, I got my mouse out, but cannot find the touchpad software or administrative location. I have an Inspiron E1705. Must of fallen asleep an hit the wrong key.
If you have the TouchPad icon in your tray (down next to the time - lower right), then you can double click on it to bring up Dell's touchpad software.
If you do not have it there, then go to the Control Panel and double click on the mouse icon. There may be a tab that comes up that says Dell Touchpad. Each system is different. You might even have to click on a link that takes you to the Touchpad setup.
Two things that I might suggest.
Link to online drivers