Recently Microsoft released a hotfix KB2686509. Unfortunately every machine of mine refuses to install this hotfix. What's more, the system gets caught in this annoying loop. Because the hotfix fails to install, the next time I go to shutdown it wants to "Install updates and shutdown." Which of course fails so it tries again the next time. Well after lots of searching and experimenting I finally found out how to get this stupid hotfix to install.
The problem here is a custom keyboard scanmap. Or put simple, I have custom mapped keys on my keyboard. This hotfix refuses to install if you have custom key mappings. The solution is as follows:
1. Use regedit and goto HKLM\SYSTEM\ControlSet001\Control\Keyboard Layout. Save a copy of the key, then delete the value "Scancode Map."
2. Reboot your computer.
3. Install the update again. If the update still fails, manually download and install. Visit www.microsoft.com/downloads and search for KB2686509.
4. Restore your "Scancode Map" registry key and reboot one more time.
This worked for me, hopefully it works for you.
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