IE 9 Windows Update Error 9C48

“Error Code 9C48: Windows Update encountered an unknown error.” 

This error occured when trying to install the following update “Windows Internet Explorer 9 for Windows Server 2008 R2 for x64-based Systems.


  • Uninstall IE9, if you already have it installed, and restart the system.
  • Disconnect from the internet. This is important because the installer attempts to download the latest, bad binaries from Windows Update.
  • Let the install finish and then restart system.
  • Reconnect to the internet and check Windows Update.  You should be able to see the Cumulative Update for IE9, instead of IE9 itself.

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