Missing operating system  

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  1. Posts : 14,004
    Windows 10 Pro X64 21H1 19043.1503
       #11

    The current solution seems to be to Clean Install 8.1, activate then upgrade to 10.
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  2. Posts : 8
    Windows 8.1
       #12

    Ztruker said:
    The current solution seems to be to Clean Install 8.1, activate then upgrade to 10.
    Thanks, but did you actually try this (edit: or have seen a post/site where someone tried and succeeded), having had the same problem? I'm considering doing a full format of my SSD drive, then follow your potential solution. My guess is that there's some issue with the partitions from my previous install, which only a format will overcome.
    Anyone tried something like this yet?
    Last edited by TucknDar; 03 Aug 2015 at 14:33.
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  3. Posts : 14,004
    Windows 10 Pro X64 21H1 19043.1503
       #13

    I've read at least 5 posts in this forum where doing this worked when the upgrade was failing.
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  4. Posts : 8
    Windows 8.1
       #14

    OK, thanks. It's just that I haven't seen anyone with the "Missing operating system" failure actually having got Windows 10 properly installed yet. I think I'll try to install 8.1 clean, then upgrade. I'll format the drive first. Will post back (hopefully from Win10) when I'm done.
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  5. Posts : 14,004
    Windows 10 Pro X64 21H1 19043.1503
       #15

    Don't format first. Delete all partitions during the 8.1 install then click Next without creating or formatting any partitions. Let the 8.1 installer create what it needs.
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  6. Posts : 8
    Windows 8.1
       #16

    Ok, thanks again.
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  7. Posts : 14,004
    Windows 10 Pro X64 21H1 19043.1503
       #17

    Good tutorial for 8.1 here: Clean Install with Windows 8 Upgrade
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  8. Posts : 1
    win and mac
       #18

    one more


    Hi people. I'm in the same problem. Try any kind of reformating disk by win setup, by g-parted, upgrade over a clean install of 8.1, and the same but with USB setup (upgrading). Try to uncheck the write cache of the SSD, but always the problem is the same. The only way I can install w10 is clean install , but then the key don't work, of course. I'm waiting to solve.
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  9. Posts : 1
    windows 10
       #19

    Ztruker said:
    The current solution seems to be to Clean Install 8.1, activate then upgrade to 10.
    Did exactly that and everything worked and I did restarted the system many times but next day ... missing operating system error again...
    by yhe way I have a 3 years old SSD hard drive
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  10. Posts : 8
    Windows 8.1
       #20

    I also tried all the above mentioned methodes; no succes.
    The only way i can think about at the moment is: (i have a SSD and a harddisk in the laptop)
    Backup and empty my harddisk. Copy my SSD imasge to my harddisk. Start from it and see if it works and still is activated.
    If so, then disconnect or hide my SSD. Perform the upgrade (in any way) on the harddisk. See if it works and if it gets activated. If so then put the image back on the SSD (or perhaps do a clean install on the SSD).

    I have no time the coming days to try this, but at the moment it is the only way i think is left to try.
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