Web browser doing funky things with videos and ads?

It’s kinda hard to explain, but my IE9 has started to, and just on some (usually animated) ads and some videos, decide to play them from the top left corner and over the regular screen, however far that is. I can’t control the videos and can’t hit the close button on the blinking, glitchy advertisement.
It’s very irritating. The space on the web page where the video was supposed to go is white. So is the ad space, sometimes. Sometimes there isn’t a space for the ad, though, it’s just a stand-alone ad in my way.

I have no idea why this is or how to fix it, but I’d like to fix it. It’s interfering with me going to many sites (luckily not Fluther!) and crashing the browser all the time.

Anyone have a similar problem? And/or a solution?
Thanks!!