I have this morning tried to download and install the new update for extreme security.
IE reports that the file has an incorrect signature.
I have downloaded it twice to check against download problems.

When trying to install it i get the following messages...

Installer failed to initialize. Please try to download and run the installer again.

Could not load the DLL library
(Is64Bit) The specified procedure could not be found.

I am running Vista 64bit.