Hi DR. I'm Greg, an installation specialist, 10 year Windows MVP, and Volunteer Moderator here to help you.
Download, install and run a full scan with the most powerful on-demand free scanner Malwarebytes:
https://www.malwarebytes.com/mwb-download/.
In the Malwarebytes Settings > Security tab set it to include scanning for Rootkits.
If necessary run it in Safe Mode with Networking, or Safe Mode accessed by one of these methods:
https://www.digitalcitizen.life/4-ways-boot-saf...
Clean up anything found, restart PC and then run again until it comes up clean.
Then download, install and run a full scan with AdwCleaner:
http://www.bleepingcomputer.com/download/adwcle... Remove whatever it finds.
Check for any remainders in Settings > Apps > Apps & Features, and also in each of your browser's Extensions, Home Page settings, Search service or Add-On's as shown here:
https://www.computerhope.com/issues/ch001411.htm
Then check for damaged System files by running System File Checker from Step 10 in this checklist:
http://answers.microsoft.com/en-us/windows/wiki....
If completing all of Step 10 in above Checklist doesn't fix it then run a Repair Install which reinstalls WIndows while keeping your files, programs and most settings in place, by installing the Media Creation Tool from this link
http://windows.microsoft.com/en-us/windows-10/m..., open the tool and choose Upgrade This PC Now. This will solve most problems and also bring it up to the latest version which you need anyway and by the most stable method.
If you want to keep Malwarebytes as an on-demand scanner then you can turn off its Real Time trial version in it's Settings > Account Details tab.
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
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Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.
