Installing security update of Silverlight fails with ERROR code 64C (Windows Server 2012 R2)

This week I had a problem during the patching of a Windows Server 2012 R2. Silverlight could not be updated. The Error code was 64C and below you will find a screenshot of the problem.


In the KB of Microsoft the solution has been explained. But I will walkl you throw the steps with some screenshots. KB:

Open notepad and paste the following line in the notepad window:

reg delete HKLM\Software\Microsoft\Silverlight /f
reg delete HKEY_CLASSES_ROOT\Installer\Products\D7314F9862C648A4DB8BE2A5B47BE100 /f
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\D7314F9862C648A4DB8BE2A5B47BE100 /f
reg delete HKEY_CLASSES_ROOT\TypeLib\{283C8576-0726-4DBC-9609-3F855162009A} /f
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\install.exe /f
reg delete HKEY_CLASSES_ROOT\AgControl.AgControl /f
reg delete HKEY_CLASSES_ROOT\AgControl.AgControl.5.1 /f
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{89F4137D-6C26-4A84-BDB8-2E5A4BB71E00} /f
rmdir /s /q "%ProgramFiles%\Microsoft Silverlight"
rmdir /s /q "%ProgramFiles(x86)%\Microsoft Silverlight"


Save as “CleanSilverlight.cmd” and right click and select “Run as Administrator


Try to re-install Silverlight.


Click “Install”


Installation has been completed.




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