Did you try downloading the latest SDAT and performing the updates manually?
You can get the SDAT at this link => http://www.mcafee.com/apps/downloads/security-updates/security-updates.aspx?regi on=us
If I understand you right , when you open security center , all you have is a pale white box . Most probably the update you refer would have happened for your windows that included IE 9.
Open Internet explorer – Click on Help Then click on About Internet Explorer and check if it says IE 9 – If yes got to control panel and the remove IE 9.
Reboot the computer and open security center ; you should be OK.