Can you let us know the following
1 What Operating system
2. What browser?
For Ie8 or 7 try to reset the browser settings in IE8 it is tools Internet options advanced reset IE settings
If that no chop run the Mcafee Virtual Technician and see if it finds the issue.
This issue usually seen with beta Windows 7 or beta IE* which should be well past.
Finally try an Uninstall reinstall of the program The uninstall must use the MCPR removal tool then reboot before reinstalling but we hope this not needed.
Did you make any recent changes for the computer ?
Please post your session id from the mcafee virtual technician ?
Open IE; click help (at the top) - About internet explorer and provide us with the information on Version & cipher strength.