|Best I know Chrome is"free"|
I suggest you run a few pest cleaner utilities (in this order)... possibly you have acquired a wee nasty/pest...
I have found that if malwarebytes is running (active in the background) it will interfere with adwcleaner; which is why I suggest the above order... (or stop malwarebytes running whilst scanning with adwcleaner)
Also - as a precaution - I suggest you copy anything important (personal files, photos etc. that you wouldn't wish to lose...) to external media - typically DVD; before scanning... A useful thing to do at regular intervals regardless of how well things may be running (or not).