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  1.    26 Jun 2017 #11
    Join Date : Dec 2015
    Posts : 25
    Windows 10 1511
    Thread Starter

    I'm currently creating a 8.1 boot flash drive. If that fails I'll try your advice. Thanks - your help is much appreciated.
      My ComputerSystem Spec
  2.    27 Jun 2017 #12
    Join Date : Dec 2015
    Posts : 25
    Windows 10 1511
    Thread Starter

    Progress - of sorts. I can now get to the C drive and I can see all the Windows files. What command do I use (and from which folder) to launch Windows?
      My ComputerSystem Spec
  3.    27 Jun 2017 #13
    Join Date : Jul 2015
    Posts : 9,394
    Windows 10 Pro

    Probably setup.exe from the USB flash drive.
      My ComputerSystem Spec
  4.    27 Jun 2017 #14
    Join Date : Dec 2015
    Posts : 25
    Windows 10 1511
    Thread Starter

    I ran the setup.exe and the machine is now looping through the Dell splash screen and then to an error message 'Your PC ran into a problem and needs to restart' with the error code 0xc000021a.

    The machine is not going to c: prompt when I do a cold reboot and hit F8 but loops through the above. Ahhhhh!!! Any ideas? The machine is a month out of warranty!
      My ComputerSystem Spec
  5.    27 Jun 2017 #15
    Join Date : Dec 2015
    Posts : 25
    Windows 10 1511
    Thread Starter

    I have removed the flash drive, applied F8 on reboot, and I can get to the Dell SupportAssistant which runs a couple of tests and then reports 'Hardware scan complete an no issues'. That's got to be good news? The only option it offers is 'Shutdown'. Hitting SHutdown and then rebooting without the flash drive in goes to the Dell SupportAssist screen with a 'No bootable devices found' (unsurprising). With the flash drive in it then takes me through the above-mentioned loop.
      My ComputerSystem Spec
  6.    27 Jun 2017 #16
    Join Date : Jul 2015
    Posts : 9,394
    Windows 10 Pro

    If you are booting from a Windows installation USB flash drive the first screen you should see is:

    Click image for larger version. 

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    Then you will navigate through a few other setup screens until you get to this one:

    Click image for larger version. 

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    You should then click on the Custom: Install Windows only (advanced) option and this is the next screen:

    Click image for larger version. 

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    Is that what you are seeing/doing so far? Then on that screen you should delete each partition on the hard drive until it is nothing but unallocated space, highlight the unallocated space and click next. That is how you wipe everything off the hard drive (erasing it), and do a brand new, clean install of Windows only.
      My ComputerSystem Spec
  7.    27 Jun 2017 #17
    Join Date : Dec 2015
    Posts : 25
    Windows 10 1511
    Thread Starter

    I'd made my way to that point before but I had no idea what deleting all the partitions would do so I backed off. I've followed you instructions and it is now installing Windows from the USB so hopefully it will complete.

    I am extremely grateful for your help and patience - it really is very much appreciated. Hopefully, my knowledge will increase and one day I may be able to help someone else.

    Again, my thanks.
      My ComputerSystem Spec
  8.    28 Jun 2017 #18
    Join Date : Dec 2013
    Sydney, Nova Scotia, Canada
    Posts : 10,436
    Windows 10 IoT

    NavyLCDR knows his stuff. Custom install is what I do on a clean install. I delete all partitions except my Data partition/drive. I keep my Documents, Pictures, etc on a separate drive or partition. I just do a change folder location after my clean install. Anyway, Windows will auto create the partitions it needs if you install to unallocated space. All the correct size too. It's the way to go to reduce issues latter on.
      My ComputerSystem Spec
  9.    28 Jun 2017 #19
    Join Date : Aug 2014
    Forever West
    Posts : 3,922
    Win10 Home and Pro, Win10 Insider Preview, Win7 Home, Linux Mint

    For Upgrades I've copied the .iso file to a USB Thumb drive and in File Explorer I use right-click on that file and Mount which creates a pseudo DVD drive then run setup.exe from that. It doesn't work for a clean install unless following other suggestions given here for creating a bootable USB. When done it can be ejected.
      My ComputerSystem Spec
  10.    29 Jun 2017 #20
    Join Date : Jul 2016
    Posts : 43
    windows

    Then mount the ISO file you have saved and copy all the files and folders from the mounted ISO file to the USB flash drive.
      My ComputerSystem Spec

 
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