How can I take these videos out?

So all of a sudden on my homepage, yahoo, i have these videos in the ad section and they're all disgusting, like girl kissing girl, or Carmen Electra lingerie. They're disgusting and I don't want to see them anytime I log on, and it's not only on my yahoo, but mostly all the websites. It's getting annoying. Is there any thing I can download for free that eliminates things like this? Like a software or something? Thanks.