Ads keep appearing on some pages (annoying)

Hi I've had a MacBook Pro for almost ten years, but started to slow up once I updated the operating system. So I bought a MacBook Air which is great, last night I tried to install some software using a YouTube video as a guild & I now keep getting loads of stupid ads over some of my pages. I was going to install Vuze software but when I saw all the Mackeeper ads etc I decided not to install, but I've got the stupid ads.

Does anyone know where these are stored & how to remove them.

Thanks.

Hi thanks for your reply.

I downloaded Ad-blocker yesterday, but this is what I'm still getting.

See the way the word Game has altered



& when you hoover the mouse over it, this appears



Also when I open a new page, I get this



I never had any problems before yesterday when I went onto youtube.

JuryDuty said:

That looks like a popup ad specifically put on that website by the owners. Does it happen everywhere?

EDIT: Well, I just went to that site on a couple browsers and NEITHER has that ad. One of my browsers has AdBlockPro, the other has no ad blocking at all.

I'm thinking you have a browser extension or something that snuck in there. It looks like malware or something... not sure...

Click to expand...

Yes that's what I'm thinking, no it doesn't happen everywhere, it happens on here, on the website pictured + a few other sites. I don't get it on Facebook or eBay etc.

I have tried to find it & have deleted loads of stuff, but I can't get rid of it, so not sure where it is stored :-( It's really hard to work with stuff like this.

& also it's only on this MacBook Air, if I use my old MacBook Pro (which I don't very often now) it's fine, so it's a problem with this MacBook Air. Actually my iPad, iPhone & my Samgsung Galaxy Note Work phone are all fine.

Weaselboy said:

http://www.adwaremedic.com/index.php

Try using AdwareMedic to detect and remove any malware or adware you may have inadvertently installed.

Click to expand...

This seems to have fixed it, thank you

I'll donate to them, I'm very grateful for people who provide software & then ask for a donation.

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mrkramer said:

You said that you were installing software using a youtube video as a guide, was that software legally obtained? If you were trying to pirate something it wouldn't surprise me if the installation you got was instead one of the malware apps out there for the mac pretending to be something else.

Click to expand...

Well it didn't say, but I'm guessing so now. I won't be doing that again & I shall inform on the youtube video of the problems I had.

Thanks for the help everyone, I hope I'm ad free again now