Why do I have excessive advertisements in Chrome and Firefox?

[chickenlad7db]

Now, don't get me wrong, I know how many ads are usually on a page. I still have the regular ads but in addition to those, I have 3-4 more ads. I have a banner pop up across the top of my screen and at the bottom. And then Banners that pop up on the side, basically creating a border of ads around my screen. Then a lot of words ( text on the website I am looking at) are highlighted blue and whenever my cursor hovers over the word an ad pops up next to my cursor. I also sometimes when I use a website, like a search engine, that whenever I hit enter to start my search I get redirected to a new webpage that is a lone advertisement. There are so many ads that my web processors are slowing down and becoming nearly unmanageable. I haven't wanted to uninstall and reinstall the browser in an attempt to save my massive amounts of bookmarks, but I don't know what to do. I have used my anti-virus program ( Kaspersky) to scan my entire system but I have not found any sort of virus on my system. I have never had a problem with before but suddenly it started happening. In chrome, I have also randomly stated downloading something called "Update.exe" even though I did not accept any download. It randomly downloads an executable without my permission. Ever since that has happened, I have been scared to even use the internet on that computer in fear of what is happening.

The ads are on Google Chrome and FireFox.

Any suggestions?

Thanks.
EDIT: I have checked my extensions and there are not any installed other than Kaspersky.. I even have it set to maximum internet security and ads should be disabled...

[Kashif]

Chrome
At top right, below "close" button you will see "3 horizontal lines" click it, then select Settings >> Extension. There you will find all the extensions your chrome is using , search & uninstall the crap extensions like (outuobox , passshow etc). you can also install "adblock" from google web store which automatically blocks all ads for you, click below
https://chrome.google.com/webstore/detai...idom?hl=en

Firefox
Similar is the case for firefox but to find the extension tab goto top left , select Firefox drop down button >> Add-ons >> Extension.
click below for firefox ad blocker
https://addons.mozilla.org/en-US/firefox...lock-plus/

Hope it helps
Cheers

[Fred]

The first thing I would do is run a scan by the free version of Malwarebytes. This should get rid of the malware on your computer that is generating these ads.

Adblock Plus add-on helps a great deal but will not remove the malware. Many anti-virus programs do nothing about malware. You need both.

[DunbarPappy®ϟϟ]

Unmodified, browsers will bring back all kinds of junk.
Users must modify them for both privacy, security, and to limit the junk.
Firefox: http://ca.answers.yahoo.com/question/ind...202AA4cljP
Chrome: http://ca.answers.yahoo.com/question/ind...409AAZGnI6

[Earl]

had the same problem. the ads were so annoying especially being redirected everytime ugh! anyway, turns out its actually a virus that causes that. i fixed mine using some program i found on the internet check it out below.