Information on Windows Update error 80070646 or 646

Windows Update error 80070646 or 646

If you receive Windows Update error 0x80070646 or 646 while checking for updates, the error indicates that Windows Installer has failed.

For steps you can take to fix this problem, see this article on the Microsoft Support website. (KB2258121  You receive error code 0x80070646 or error code 646 when you attempt to install Microsoft Office updates)

Error codes this applies to:

  • WindowsUpdate_80070646

  • 0x80070646

  • WindowsUpdate_646

  • 646


Comments (4)

  1. Martha Dempsey says:

    I am still not able to download the update and continue to get the 646 error code

  2. robmar says:

    Hi Martha – what OS are you running

  3. Carol McGrath says:

    I can't download the updates for security microsoft word 9  error 646 still comes up

  4. robmar says:

    Hi Carol – which OS are you running?

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