|Ads on websites may be a nuisance but they are not malware, so no malware scanner will help with that. Ads help to pay for running the website so they are a necessary evil, but there is something you can do - read on ....|
For Firefox you just need to install an add-on which blocks (most) ads so all you get is an empty space where the ad should be.
For Firefox 11 and higher there is a list of Ad Blocker add-ons here so read the reviews first then choose one: https://addons.mozilla.org/en-US/fi...
They only work with Firefox. I can't help you with other browsers because I never use anything other than Firefox.