Windows 8 and 8.1 Forums


Having problems installing win 8.1

  1. #1


    Posts : 5
    win 8 pro

    Having problems installing win 8.1


    I'm running win 8 pro, and I've been trying to upgrade to win 8.1, but it's not working at all. It will get to 95 percent installed, then a popup window will say cannot finish installing windows, then it restores the previous version I was running. Has anyone heard of this or has it happened to anyone? Thanks

      My System SpecsSystem Spec

  2. #2


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    What Anti-virus are you running? If it's not Windows Defender, turn it off or uninstall it and try again.
      My System SpecsSystem Spec

  3. #3


    Posts : 5
    win 8 pro


    I'm running NIS Norton internet security. I'm not getting any messages from it. It downloads, and it get up to 95 percent installation, then aborts, and restores the previous version.
      My System SpecsSystem Spec

  4. #4


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    Is this a OEM manufacturer's PC with Pre-installed Windows 8?
      My System SpecsSystem Spec

  5. #5


    Posts : 5
    win 8 pro


    No. I built this thing two years ago.I had win7 pro, then when 8 came out, and it was stable, I purchased the pro version of 8
      My System SpecsSystem Spec

  6. #6


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    Check the manufacturer's web site for up to date for Windows 8.1, than try installing.
      My System SpecsSystem Spec

  7. #7


    Posts : 5
    win 8 pro


    manufacturer of what? I built this comp. There is no tech support
      My System SpecsSystem Spec

  8. #8


    Posts : 959
    Windows 8.1, 10


    I'm assuming you bought the Windows 8 Pro as an upgrade and still have the product key?

    If so then another method, if you have everything backed up and don't mind reinstalling everything (because it will wipe the partition), would be to try a clean install from the 8.1 ISO.

    If it still works, you should be able to get the 8.1 ISO using this trick:
    How to download the Windows 8.1 ISO

    Assuming that works, then to get the 8.1 ISO to install, you initially need an 8.1 Product Key (see here and especially the Note on post 1) but then once it's installed you should be able to get it to activate by entering your Windows 8 Pro product key.
    Activate retail Windows 8.1 with Windows 8 Product key.
    You need the original Windows 8 Pro product key from the email when you bought Windows 8 (or in the box if you bought it boxed). If you've installed Media Center, the key you need may not be the one active on the PC itself at present so won't be visible with key readers.

    Backup first before trying this though!
    Last edited by DavidY; 05 Jan 2014 at 19:52.
      My System SpecsSystem Spec

  9. #9


    Posts : 5
    win 8 pro


    I bought the full version of win 8, and yes I still have the key. It's alot of work, but it sounds like I have no choice. Thanks for your help.
      My System SpecsSystem Spec

  10. #10


    Posts : 959
    Windows 8.1, 10


    Depends what you mean by the "full version"?

    I think the download process described will only work if you bought the Upgrade edition of Windows 8 Pro, which was used to get from XP/Vista/7 to 8.
      My System SpecsSystem Spec

Having problems installing win 8.1
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