How can I drag and drop using the notebook touchpad?
I'm using Windows Vista on a Dell Inspiron
This is dependent on the driver you use.
Your best bet to start is to take a look at "Control Panel" > "Mouse" and then having a look through the settings.
But as sblair said, by default - if you have tap to click on, you double tap holding the second then drag and drop to where you want... so +1 to sblair.