Moved to General Discussion.
Try rebooting again, sometimes it takes another one to get things working.
If no success try downloading the Virtual Technician to see if it finds and fixes any issues. http://mvt.mcafee.com/
Make sure your system is entirely up to date, including parts you may not use, such as Internet Explorer (McAfee uses that regardless of default browser).
Technical Support is always available for you free of charge by phone or online chat and linked below.
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Also please indicate if you have any other security software installed, had any signs of malware infections and what operating system this is.