Hi,
Please clarify the below:
1. What is the operating system that you use?
2. Please specify your computer’s configuration as well (Minimum 256 MB RAM required)
3. Make sure you don’t have any other security programs installed in the computer, if so uninstall them (E.g: Norton, Trend Micro, Spy Blaster etc…)
4. Also specify the version of McAfee programs that’s installed currently.
5. How did you install the new version of McAfee, did you remove the older version completely that came along with the computer, if not run McAfee Removal Tool
http://service.mcafee.com/faqdocument.aspx?id=TS100507&lang=en_US&prior_tid=12&AnswerID=16777217&tur... and then reinstall McAfee.