Windows Update Error code "0x80070646," "646," or "1606"

This article (KB2258121) provides a fix for a problem in which you receive error code 0x80070646, error code 646, or error code 1606. This update issue occurs when you install Office updates by using Windows Update or Microsoft Update. For detailed information, see the “Symptoms,” “Cause,” and “Resolution” sections of this article.

To download the fix for this update problem, click the View and request hotfix downloads link that is located on the upper-left of the screen.

When you try to install updates for Microsoft Office applications through Windows Update or through Microsoft Update, you may receive one of the following error codes.

Error code 1
0x80070646

Error code 2
646

Error code 3
“Error 1606 Could not access network location %APPDATA%”

This update problem occurs when Windows Installer encounters an error. Error code 0x80070646 and error code 646 are generated by Windows Installer. These generic errors indicate that Windows Installer encountered a problem. When you encounter the errors that are described in the "Symptoms" section, the problem may be caused by an incorrect value in the registry.

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