Can't easily scroll through pages when reading PDF documents

Navigating PDF documents using ADE is a hard pull.  I can't scroll up or down pages unless I click the scroll bar, which is especially frustrating as I have a touchscreen laptop but can't use the touchscreen feature to scroll when using ADE.  Neither can I use the directional keys to scroll except on the rare occasion that strangely enough the directional keys allow me to scroll up and down the page using them.  This is always a very temporary situation.  Can anyone help me to solve this annoying problem?