How to get rid of the ads that pop up everywhere?

I was doing my summer Spanish homework, listening to a song on this page: http://zachary-jones.com/zambombazo/cancion-teacher-teacher-campamento-de-verano/. Suddenly, an annoying Ask.com ad pops up on the bottom right corner, with something like: "Are you searching for ---? Click here!" It's long, rectangular, white with blue letters. Has anyone else seen ads like this? But look at this: the website clearly reads: "Our ad-free website is entirely supported by readers like you. If you have enjoyed any of our free activities this year, such as our numerous music activities, please support our site by purchasing our special-edition Summer Spanish 2013 eBook for $4.95. We greatly appreciate your support!"
So these ads are definitely not part of the websites I visit. I also get pop-ups with red "x" buttons, but Ad-block blocks the main body, which is usually casino games. Also, taller and narrower Ask ads pop-up on the right, along with white rectangles with black text.
On http://www.nestoralvaro.com/blog/2011/11/18/removing-ads-iframes/, I got a bookmark that gets rid of I-Frame ads, but sometimes other I-Frame elements on the page are also obscured. For example, on the Zachary-Jones page, the bookmark also removed the audio I was listening to.
I use Google Chrome, have Windows 8, and our Wi-fi is provided by Verizon. When I use hot-spot from an iPhone, I have no problem with these ads.

Added (1). Sometimes, when I click on a link, it redirects me to a page that says: "This link has expired, redirecting… " and there's an orange rectangle in the middle of the screen. When that happens, it usually leads me to a random website, but I usually click the back button, try the link again, and find that it works! What's up with that?

Added (2). (I already have Ad-block, which doesn't block these ads.)

Added (3). I couldn't find anything suspicious in my programs, which doesn't mean there isn't anything, but I'm suspicious about my Wi-fi provider because when I use iPhone hotspot, I don't have this problem. Has anyone ever heard of piggy-backing ads on Wi-fi? Or maybe it's a virus?

Https://chrome.google.com/webstore/detail/adblock/gighmmpiobklfepjocnamgkkbiglidom?hl=en

First of all, get adblocker for chrome. It is free and absolutely wonderful. It is on the chromestore for extensions. If this doesn't work, then you may have a chrome extension that enables this ad, so check and see what extensions you have enabled in your settings. Third, you may have some annoying adware installed on your computer, so check your installed programs on your control panel to see if anything is there that you never authorized or that looks out of place.