1.    07 Feb 2016 #1
    Join Date : Jul 2015
    Posts : 14
    Windows 8.1

    Windows 10 Upgrade Error

    I did a fresh install of windows 8.1 (pro x64) on a spare laptop of mine a while back.
    I thought of upgrading it to windows 10 (pro x64). When I try to upgrade everything goes smoothly until the screen where there is a big dial in the center. It goes to about 35% and the status of copying files is at around 75% and the system restarts. After it restarts a screen appears which says Restoring your previous windows and I get an error message 0x80070b7 (or something like that) which says something of this sort 'Windows 10 installation failes in SAFE_OS phase PREPARE_FIRST_BOOT'.
    If anyone can provide some steps I'll be grateful, I have'nt had any luck googling about it.
    TL;DR Want to upgrade to Windows 10 but cannout due to PREPARE_FIRST_BOOT Error
    Click image for larger version. 

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    Last edited by Multikill; 07 Feb 2016 at 12:44. Reason: Adding pciture
      My System SpecsSystem Spec

  2.    07 Feb 2016 #2
    Join Date : Mar 2015
    Posts : 85
    Windows 10 Pro x64

    Google is your friend - just entered the error message and up popped various solutions -


    Happy reading & good luck!
      My System SpecsSystem Spec

  3.    08 Feb 2016 #3
    Join Date : Jul 2015
    Posts : 14
    Windows 8.1

    Thanks for your input but I did not have any luck with any of those solutions
      My System SpecsSystem Spec

  4.    09 Feb 2016 #4
    Join Date : Jul 2015
    Posts : 14
    Windows 8.1

    Okay so what worked for me was that my Windows 8.1 Pro was installed as EN-India and the iso that I was using was in EN-US (I download it from the torrent). So the error was due to different regions, if it helps anyone.
      My System SpecsSystem Spec


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