Just in case more information is needed, I am running Windows 7 Professional 64 bit, with internet explorer 9.
My mcafee software versions as listed in the program are:
Security Centre: 10.0 (build 587)
Virusscan: 14.0 (build 309)
Firewall (disabled): 11.0 (build 385)
Siteadvisor: 3.1 (build 175)
Parental controls (not in use): 12.0 (build 283)
Quickclean and shredder: 10.0 (build 240)
I can only guess that you possibly have Parental Controls turned on and you are using a User Account that is labelled as a child, which automatically restricts viewing certain things.
It's difficult to say what's causing this really without more details. If your taskbar icon is square (2009 version) double-click it and then in the open SecurityCenter click "About" and post the version number for all the installed components.
If your taskbar icon is a shield (2010 version) double-click to open SecurityCenter then click Navigate at top right and then About at the left to find that information.
The ultimate Technical Support is provided as online Chat via Useful Links at the top of this page. There an actual technician can connect with your computer if necessary to check what is causing this.
Sorry I just realised you stated SecurityCenter 10 which is the 2010 version. I don't use Parental Controls myself but there is a comprehensive help section. Just click Help at top right and then Help again.
You could also look to see if your browser has any non-default settings which may be causing this.
Failing that I suggest you contact Technical Support online Chat.