Welcome to the forum. I'm not a hardware expert by any stretch of the imagination, but my guess is that may be a graphics card issue. If you will post your system specs I'm sure some of the other members can offer some insight.
Edit: I see Anna responded. She is one of those hardware experts that I was referring to.
Can you describe the small animation? Maybe get a video with your phone and post on the forum here.
I am trying to imagine what is even happening on your system that would cause an animation to play.
You should be able to use a screen capture program like CamStudio to make a video of it also. Sounds weirdo...