It may not be an infection, do you run Registry Cleaners by any chance? They can cause this. If so, try restoring whatever it did. Also competing software can cause issues, anything like that installed or previously installed?
But just in case upo date Malwarebytes (free version is best with McAfee and is linked in the last clickable link in my signature below along with other tools) and rerun it in Safe Mode.
Usually we recommend in these circumstances that people try starting afresh by uninstalling everything via Control Panel, running the MCPR cleanup tool and reboot, then reinstall from your online account.