I am also receiving the same dialog box each time I start Windows:
"There was a problem that caused parts of the Windows Live ID Sign-in Assistant to be disabled. You might not be able to sign in to Windows Live in some programs. The problem may have been caused by a program that was recently installed. For more information, please go to: http://go.microsoft.com/fwlink/?linkId=144689"
This started a few weeks ago. Apart from downloading upgrades I am not aware of any new programs I have installed prior to this message.
John