Is it just me or are there random words underlined on here that then turn into links? Happens on my school website as well
Have a look on your browsers settings or properties and see if there are any extensions/add-ons that you don't recognise then delete them.
There are hundreds of "adchoices" programmes out there. Kontera is another one that I have constant problems with and I've a sneaky feeling it my stem from the Star website reading Barnsley articles! Some of them you have to block specifically in your web browser but they are very hard to permanently get rid of as they aren't actually viruses