Scrolling on a laptop

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I use a laptop which has a pad instead of a mouse with a scroll wheel, to scroll up or down or side to side I have to left click and hold then move my finger on the pad in the direction i want to scroll, just
recently in some programs I use such as Corel print house the page has started to move just by running my finger over the pad without left clicking and holding down, I was only wanting to move the cursor not the page. Can anybody tell me why this happens & how I can stop it from happening.