Q. What causes the "Initialization error 0x800A1391" error message that I receive when I access Windows Update?

A. This error occurs when Windows Update can't download and install the Windows Update ActiveX component. This problem sometimes occurs when a firewall blocks the download of the component. If you've verified that your firewall isn't causing the error, a possible solution for the problem is to add the following sites to the Microsoft Internet Explorer (IE) Trusted Sites zone on the system on which you're using Windows Update:

http://windowsupdate.microsoft.com
http://v4.windowsupdate.microsoft.com
https://v4.windowsupdate.microsoft.com
http://v5.windowsupdate.microsoft.com
https://v5.windowsupdate.microsoft.com
http://download.windowsupdate.com

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