1.    3 Weeks Ago #1
    Join Date : Jul 2015
    Posts : 29
    Windows 10 Pro 64 bit

    1511 to 1607 Update Error 0x800700c1

    I have Windows 10 Pro Version 1511, OS Build 10586.589.

    Windows continually attempts to download and install the anniversary upgrade.
    The download completes, but the installation fails with error code 0x800700c1.
    This has happened more than 50 times.
    (As appears quite common, I have never experienced an update error before.)

    I have tried every suggested fix I can find - nothing works.
    I have tried installing from 1607 ISO - fails
    I have tried installing using Windows10Upgrade28084.exe - fails
    I have tried letting Microsoft Support have a go - fails

    I am unable to find the meaning of the error code above, so there seems to be no way to effect action here.
    Does anybody have any knowledge on this one?
      My System SpecsSystem Spec

  2.    2 Weeks Ago #2
    Join Date : Jan 2015
    UK, Midlands
    Posts : 5,759
    Win 10 Pro (1607)

    Hi, I can understand the frustration.

    Now given that you've tried 'every suggested fix' it's bound to be the case that if someone suggests sthg you'll come back and say 'tried that', given that you've not stated what you have tried.

    Here are some initial ideas:
    1. From an admin command prompt
    [Windows key + X, click command prompt (admin)]
    chkdsk C: /F
    Your PC will need to restart.
    Make sure the result is clear or fixed- else do not proceed.
    Post back the result, which you can get after a restart as follows:
    How do I see the results of a CHKDSK that ran on boot? - Ask Leo!

    2. Do a clean boot and disable any AV. Disconnect any unnecessary peripheral. Make sure you have at least 500Mb of unallocated space on your system disk. Make sure you have 20Gb + 10Gb free on your system partition.

    Then try the manual upgrade. Don't try to download further updates if offered.

    3. Inspect setup error logs
    Win 10 AU upgrade:
    Hopefully you’ll see a log here: C:\$WINDOWS.~BT\Sources\Panther\setuperr.log

    4. Check if your BITS service is running.
      My System SpecsSystem Spec

  3.    2 Weeks Ago #3
    Join Date : Jul 2015
    Posts : 29
    Windows 10 Pro 64 bit


    Thanks for your time and your suggestions.
    I didn't get around to trying them because on the 63rd attempt, Windows successfully installed the update.
    There was no input from me at all - it just happened.
    So the software was downloaded literally 63 times before this process completed.
    Only glad I'm not paying by the minute!
      My System SpecsSystem Spec

  4.    2 Weeks Ago #4
    Join Date : Jan 2015
    UK, Midlands
    Posts : 5,759
    Win 10 Pro (1607)

    Goodness me..! That's a lot of download time.. I'd have opted for the manual root after a couple of attempts.

    Now, be warned.. there are then several updates, two large and problematical for a number - download problems mostly. For fixes, please see the thread about that update in the News section here.
      My System SpecsSystem Spec


Similar Threads
Thread Forum
Feature update to Windows 10 Education, version 1607, Error 0x8000ffff
Feature update just became available today for us. Out of 4 laptops its failed on 4. W10 1507 education has been running for a few weeks. Updates to 1507 were working fine. Installation Failure: Windows failed to install the following update with...
Windows Updates and Activation
Solved WIN10 upgrade 1511 to 1607 fails. Error 0dx000009a
I have installed WIN10 (ver. 1511) a couple of months ago. While trying to solve a driver issue I've been advised (by MICROSOFT) to upgrade to ver.1607. Several upgrade attempts all failed (with code 0xd000009a) What does it mean? Any more details...
Windows Updates and Activation
Updated Version 1511 to anniversary update, 1607, but still at 1511
Hello all. Running windows 10 pro 64 bit. I've updated from Version 1511 to the anniversary update, 1607. Or at least, I thought I did.
Windows Updates and Activation
Feature update to Windows 10, version 1607 - Error 0xc1900204
The issue in short is in the title. Feature update to Windows 10, version 1607 - Error 0xc1900204 The update does not seems to install. Any fix to this issue? :(
Windows Updates and Activation
Solved Update for Windows 10 Version 1511 (KB3122947) - Error 0x80070643
Having a problem installing this update on my 32 bit machine which really only has Firefox on it and a few documents. Have run the batch file to reset and re-register windows update but its still failing. Any solutions?
Windows Updates and Activation
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

© Designer Media Ltd
All times are GMT -5. The time now is 04:37.
Find Us
Twitter Facebook Google+

Windows 10 Forums