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  • Someone on Twitter said this happens for computers with multiple drives, and this computer does indeed have multiple drives, but I really don't want to disconnect them to try this theory out. Commented Nov 17, 2015 at 7:23
  • I had no issues with multiple drives, Mine's a sata SSD (an 850 pro) and two spinning rust drives though.
    – Journeyman Geek
    Commented Nov 17, 2015 at 7:28
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    Does it actually try to install at all? On the machine I have managed to get it installed on Windows Update spent time downloading, then "preparing" during which there was more downloading, and then finally the reboot and install. Which stage is it failing at? How old is the machine? What do you see in C:\$windows.~bt\ ?
    – Mokubai
    Commented Nov 17, 2015 at 7:55
  • @mokubai it never gets to the reboot stage, it downloads, preps, fails. If only there was any kind of information about why it is failing... Commented Nov 17, 2015 at 23:04
  • Just a hunch but you might want to check the system reserved partition (not the primary partition) for (enough) space which I happened to run into today. See this "fix".
    – RobIII
    Commented Nov 17, 2015 at 23:12