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No antivirus is 100% guiaranteed.
It would appear that you have malware/spyware onboard. Always watch carefully when downloading or updating anything that a) it's from a reliable source and b) nothing "extra" is included.
Also always keep your system totally updated including any areas you never use.
I suggest running AdwCleaner followed by MalwareBytes Free, both linked in the last link below. Read carefully on how to keep that last one free of charge.
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Here is an Excellent Removal Guide ;How to remove "Super Optimizer" (Uninstall Guide). Which basically includes the Superb Tools Colleague Ex_Brit suggested.
You may also find these Articles most informative, and can help explain how the Potentially Unwanted Programs arrived upon your system. PUPs - Potentially Unwanted Programs - Basics
All the very Best
McAfee Community Moderator
Thanks so much to both of you for your very helpful responses. I followed the instructions and hopefully am good to go now. I really appreciate the help.
Glad you are OK now.