I must lay the foundations before beginning the story. I never let Windows Update get away with silently installing the update offered. For Windows XP, I always go to %windir%\softwaredistribution\download folder and copy the installation files to a separate directory. This copying means I never have to download that same update again unless it is re-offered.
For Windows Vista, the process is slightly easy as so far I have not been able to find the location or commandline of installation process which is always run by TrustedInsaller program. Therefore, I follow the help link given in details of each individual update and download the microsoft update standalone package from knowledge base or technet and never have to download it again.
That’s where “The cumulative security update for Internet Explorer 7 in Windows Vista (KB939653)” comes into the picture. The information link given in the details for this update is
which means there are two problems, first note the white space after ‘=’ and five digit incorrect KB code. Following the usual steps I noticed that this update was never found in KB. Therefore, I had to google for KB939653 for a working link to knowledge base article.