This could happen due to two scenarios,
1. The computer might have any remnants of McAfee or any other security software.
2. It could be a malware infection.
Check and delete if you have any other antivirus software installed in add/remove programs and C:/program files and common files.
Click start – run then type services.msc, In the window that opens up check whether the start up type for all the McAfee programs are in started and automatic. If not click on the particular service and change it to automatic .
Click on the recovery tab (at the top) and select all three failures to be restart the service;
Click on OK
Close all open programs and restart the computer .
After the computer restarts , update mcafee and intiate a full scan of your computer. Report back if you have any more issues.
McAfee Online Community Moderator