Probably the old software is still lingering. Uninstall everything via Control Panel > Programs then run the MCPR cleanup tool and reboot.
Reinstall the software and make sure it's up to date.
Also make sure your system is totally up to date, including Internet Explorer, even if you don't use it McAfee does.
thank you sir. i did what you said and it fix the problem. however, another problem arises. i deactivate the license on my account then uninstall the software, i did what i read on the guide on how to use Mcafee removal tool. then when i insert the cd and try to reinstall using my CD and finish the reinstallation two tabs appear on my account. i have made a new post regarding that matter and the title is HELP! 2tabs=2licemse=1computer. please help me sir, i need those licenses. please help me.