Videos keep stopping to buffer?

Have you downloaded a large file lately? Or are you trying to look at large files? These could both be factors. Also when your computer is just running slow, you could defrag your hard drive. Doing this will 'organize' everything in your computer thus making it faster. You have to do this every once and a while and it is good for your computer. Also, maybe if the pics/videos you are looking at are online, if you are sitting in a wifi weak point, that could make the Internet signifIcantly slower. Hope this helped and good luck with your computer!