Hi Please clarify, What is the Operating system you use? How old is the computer? Did you made any recent changes to the computer? Please let know the version of McAfee program installed in the computer (Open the McAfee security center-> click on about in the left had bottom of the security center panel)?
Steps: If you don’t want the McAfee to update automatically then disable the McAfee automatic update (Click on the configure button on the Bottom right hand panel of McAfee security and make the Update to off)