I can see by reading http://www.microsoft.com/technet/security/bulletin/ms09-037.mspx that a number of antivirus programs, Spybot and a long list of other protection softwares could step in and block this update.
Read the bulletin and think over if you can disconnect the internet, disable firewalls, antivirus, spybot and what else to do this install.
I d/l MS Update KB973768 ok but it won't install. The green bar never moves so I finally cancel out. All the other updates installed ok. I have a Dell E520 Windows XP MCE sp2. Searched around and didn't find any info. Anyone else have trouble?