Photos are dragging and blocky (Pics)

I am running windows 8 on a Gateway comp that is a couple years old. The problem i am having is when i am on sites with photos they show up where they're not supposed to in just random places and overlapping other photos. I have added a couple of screenshots. The computer seems to be running ok otherwise. I have done a windows defender scan and a Malwarebytes scan and everything is ok. Any ideas how i can fix this ? Thanks.