Left McAfee for Avast because some schmuck put an idol timer in McAfee's latest version at that time, and even though scans were scheduled, THEY'D NEVER START! So, i get fed up and found Avast. And again, I like it.
did you run McAfee removal tool after uninstall?

removal tools McAfee nr. #22a http://singularlabs.com/uninstallers/security-software/