Whenever I scroll there are black and white lines on my screen

Ok well I just built a PC for my little brother and it uses onboard VGA ( its just for internet) and whenever he is scrolling alot it gets white and black lines on the screen going horizontally. what could this be? could it be it needs to update drivers? or a defective part?
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  1. I figured out it was firefox. easy fix. Switch to chrome lol
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