It sounds like you've been hit by some ad-ware or at least acquired some unwanted add-ons to your browser(s).
Follow the last link in my signature below for some advice. I recommend running AdwCleaner and Malwarebytes Free. To keep it free do NOT accept the free trial offer nor activate it, if asked.
Toronto ▪ Canada
Volunteer Moderator - Consumer Products
I CAN'T HELP PRIVATELY - PLEASE POST IN THE FORUMS
Use Advanced Search To Find Answers
It sounds as though you possibly inadvertently picked up some (PUPS) Potentially Unwanted Programs. I recommend to first run McAfee Getsusp to add these detections to the McAfee GTI Data Base. Please remember to add your Email Address under "Preferences" before scanning.
Then I would follow up with Malwarebytes (Free) and AdwCleaner. To keep Malwarebytes (Free) DO NOT accept any Free Trial Offers or enable/and don,t Activate the Pro/Paid Version. You can find these Superb (Free) Tools Here:Anti-Spyware/Malware & Hijacker Tools
You may find these two Articles most informative, as to how these arrived on your system: PUPs - Potentially Unwanted Programs - Basics
All the Best
McAfee Community Moderator