Will not install KB947821. Error code 80073712.

Will not install KB947821. Error code 80073712. Although the update KB978207 has been correctly downloaded and installed after that. All this happened after the uninstallation of McAfee antivirus. Also, I'm sure that for this reason, IE8 now does not load all run any activex so content. Downloaded and run the uninstall McAfee tool but no change.


Personal data backup (which none should be considered 100% reliable at this point) then format the HARD disk and do a clean install of Windows.  Please note that a repair installation (upgrade AKA on-site) won't fix this!

HOW to do a clean install of Vista: section "If you want to reinstall Windows Vista by running a new installation...". "of http://windows.microsoft.com/en-us/windows-vista/Installing-and-reinstalling-Windows-Vista#section_3

Once installed the clean, you will have the equivalent of a "new computer" in order to take care of everything on the page following before otherwise connect the machine to a network or the internet and before using a flash drive or the SD card that is not brand new, or has not been freshly formatted:

4 steps to help protect your new computer before going online

NB: No matter what Norton or McAfee free trial which is preinstalled on the computer when you bought will be reinstalled (but invalid) when Windows is reinstalled. Even if the trial version is not enabled, you MUST uninstall it and download/run the appropriate removal tool before you install updates, Windows Service Packs or IE updates and before installing your new anti-virus application.

Norton Removal Tool

McAfee Consumer product removal tool

See also:

Measures to help prevent spyware

Measures to help prevent computer worms

Avoid fake security software!

If these procedures look too complex - and there is no shame in admitting this isn't your cup of tea - take the machine to a local, good reputation and stand-alone computer (that is, not BigBoxStoreUSA or Geek Squad) repair facility.

~ Robear Dyer (PA Bear) ~ MS MVP (that is to say, mail, security, Windows & Update Services) since 2002 ~ WARNING: MS MVPs represent or work for Microsoft

Tags: Windows

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