|I HAD THIS EXACT PROBLEM FOR MONTHS AND JUST SOLVED IT.|
Antiviurus DOESN'T work.
If using Firefox you must install an add-on called NoScript. It stops unwanted scripts from running on web pages and TOTALLY stops it jumping to unwanted web pages.
If you then want to allow certain scripts to run on web pages (which you will want to do from time to time) you authorise it using a little button that sits at bottom right of your page.
Google 'mozilla no script' or go to https://addons.mozilla.org/en-US/fi...
It works, yippee!