I have read other posts with related "blank screen' and tried solutions with no luck. New Dell laptop with IE8 (not beta).
Inserted Internet Security 2009 disc (3 user; 2 already used) original time and everything seemed to be OK. However every login a window would pop up stating something to the affect "activate mcafee". Upon trying to activate a window stating something like "unable to complete activation at this time, but you can continue using mcafee". Anyway this became very annoying so I decided to uninstall Security Suite using Windows Control Panel program removal, then used mcpr.exe and then IEregFix.bat. Rebooted. Tried re-installing IS 2009 and now I am getting a blank (white) screen at the McAfee SecurityCenter install screen.
Check what is the cipher strength of Internet explorer ? ( Open IE >> Click Help - about internet explorer )
May I know have you done any recent changes to the computer after installing McAfee ??