Windows 10: Problem with Dual Boot

Discus and support Problem with Dual Boot in Windows 10 Installation and Upgrade to solve the problem; I had installed Windows 10 and windows 7 on seperate partitions of a drive and the dual boot option was showing and working fine but now, i resized the... Discussion in 'Windows 10 Installation and Upgrade' started by GDM Music, May 27, 2021.

  1. GDM Music Win User

    Problem with Dual Boot

    I had installed Windows 10 and windows 7 on seperate partitions of a drive and the dual boot option was showing and working fine but now, i resized the partition Which failed in the process and now i don't see any windows 10 boot option at startup. My computer boots into windows 7 without asking to boot in windows 10. Is this because of the boot files have corrupted when the partition resize failed? or something else.

    GDM Music, May 27, 2021
  2. Solaris17 Win User

    Dual Boot?

    I can help here iv had both i used partition magic to split my HDD and i installed vista on one and xp was already on the other only problem is id watch out if i were you for some reason vista does not like to dual boot iv seen this on a couple of my machines and my buddys. so step one have xp installed step 2 find a partitioner of your choice i dont know of any except partition magic and the one included on xp...only thing is i dont think the one on xp will even partition them...then pop in your vista DVD and select the drive of your choice....the only thing i can think of that causes vista to hate dual booting sooo much is that when their are 2 OS's installed xp uses its own prog to list them on boot well vista uses a totally diff boot loader than the previous os's and i think they conflict the problems i hade were the standard missing windows folder missing HAL.dll and the nt one dont remember the name.....that and after your done vista and boot into xp things didnt like to start correctly specially if you scan disk with vista.
    Solaris17, May 27, 2021
  3. topgundcp Win User
    Dual Booting with Windows 8.1

    The procedure below will allow you to boot Windows separately or in dual boot configuration.
    Here's what I recommend to do:
    1. Disconnect the drive containing Windows 8.1
    2. Install Windows 10 with one drive connected.
    3. After step 2, reconnect the drive containing Windows 8.1
    4. Boot up Windows 8.1. Open disk management and take a note of the drive letter of Windows 10 OS.
      NOTE: if you boot up Windows 10, then take a note of Windows 8.1 drive letter
    5. Open Admin command prompt and type: bcdboot X:\windows where X: is the drive letter of Windows 10 (Windows 8.1 if you boot from Windows 10 in step 4)
    6. Reboot the PC. You should have a dual boot screen.

    NOTE: To break off the dual boot setting, Win+R->msconfig->boot and delete the none default entry on the list.
    topgundcp, May 27, 2021
  4. Problem with Dual Boot

    Dual Booting

    Please follow the steps in the tutorial for how to post the screenshot. I cannot even see Disk 0, 1 and 2 on the drive map, and the columns were not spread so i can see the labels in the listings above even though it lllustates how to do this.

    As long as you don't have a UEFI install then you can move the boot loader to Windows 10 so that it manages the Dual Boot using it's menu, add the Dual Boot back from there. These same steps using EasyBCD should do it:
    Greg Carmack - Windows MVP, May 27, 2021

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