Does it scroll using and external mouse? Assume you have checked settings in control panel.
My laptop has a touchpad with a scroll function along the side. A couple of days ago it stopped working. I have looked at some forum discussions for similar issues but cannot find any solutions/suggestions for a samsung laptop. I have the NP-QX410-S02U model.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic