Possible malware I always use several other scanners as a check weekly. See my sig and run Stinger/getsusp (add your email address to its preferences and malwarebytes (free not premium version)
That said sometimes an update gets corrupted and MVT fixes what is messed up. If it happens again post back.
Anti-Spyware/Malware/Hijacker Removal Tools
I had that problem and in Services McAfee Scanner aka McODS was diabled.. so i turned it to Automactic and rebooted..
Is your internet time Synced?