Monday, April 2, 2012

How to fix Microsoft Security Essentials install error 0x80070643

I was working on a client's computer today that exhibited the following symptoms: Windows Updates not installing during each shutdown and could not install Microsoft Security Essentials. MSE installer would show error 0x80070643.

Things to check first:
  • Make sure Windows Installer service is running. Set it to manual or automatic (doesn't seem to matter from what I can tell). Click Start if it is not running.
  • Check the MSE installer log. Do a search for "return value 3".
    If found, look at the previous lines and see if they give you a clue as to the issue. In my case it said "Windows Installer error 1716". So that lead me to the following fix.
  1. Start -> Run -> Regedit
  2. Navigate to HKLM \ System \ CurrentControlSet \ services \ msiserver
  3. Double left click on WOW64. Change 1 to 0.
  4. Close regedit and reboot the computer.
  5. Try Microsoft Security Essentials installation again.

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