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That last warning is caused by McAfee WebAdvisor which is a browser add-on designed to make surfing safer.
Regarding the real-time scanning perhaps if you ran the Virtual Technician it might find and fix whatever is wrong: https://mvt.mcafee.com/
If it can't fix something then I suggest going to Control Panel > Programs and Features and uninstalling all McAfee products.
Reboot if asked.
Run the McAfee Consumer Products Removal tool (MCPR), reboot.
Reinstall from your online account.
If troubles persists then contact Technical Support, it's free of charge by phone or online chat and linked on the lower part of the Virtual Technician page
(see "Contact Support").