First icon gets selected everywhere in any page

So this is the problem in my sister's laptop and I couldn't figure out what's causing it. The laptop behaves as if the Page up button is being pressed continuously even though it isn't pressed. Here are 3 examples to illustrate:

1. When at desktop the first icon gets always selected regardless of wherever I click
2. Opening my computer (Folder 6) gets selected wherever I click
3. Opening Local disk E, the first folder gets selected even if i click on other folders. Only the first folder opens when i try to open other folders and I couldn't scroll down since the selection runs back to the first folder.