My up and down arrows on the right side of my computer screen have disappeared. How do I get them back?

My up and down arrows on the right side of my screen have disappeared. I just downloaded Google Chrome. I am not sure if they disappeared right after downloading Chrome, or that had nothing to do with it.

I googled it and I got sites with links, which I am hesitant to click on because I don’t want a virus.

How do I ge the up and down arrows back on my screen?