Windows 10: Windows 10/7 Dualboot doesnt boot / error

Discus and support Windows 10/7 Dualboot doesnt boot / error in Windows 10 Support to solve the problem; The problem is that you have the Windows 10 SSD which is GPT partitioned and using UEFI to boot. Then you have the Windows 7 HDD which is MBR... Discussion in 'Windows 10 Support' started by drpas, Aug 22, 2017.

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  1. DRPAS
    drpas Win User

    Windows 10/7 Dualboot doesnt boot / error


    What i did today: I Converted my ssd Into mbr and cleaned it via diskpart.
    I installed Windows 10 and Set it up (installed my Programs etc. ).
    I didnt try to Boot from my second Drive (Win7) because I dont want everything to be messed Up again. Should i Go for it and Just try to Boot or will it **** Up my PC again?
     
    drpas, Aug 22, 2017
    #16
  2. NAVYLCDR
    NavyLCDR New Member

    If you want to set up real dual booting:

    In Windows 10, your Windows 7 partition should have a drive letter - let's say E:. Open a Command Prompt (Admin) or Powershell (Admin) and run:

    bcdboot E:\Windows /addlast

    Change the E: to whatever Windows 7 is. Then restart the computer and you should have a dual boot menu.
     
    NavyLCDR, Aug 23, 2017
    #17
  3. LX07
    lx07 Win User
    Alternatively you can install rEFInd boot manager to your EFS.

    It will find and let you boot any Windows (or most other OS) installed on any connected disk - it doesn't matter if they are MBR, GPT, USB, SD card or whatever.
     
    lx07, Aug 23, 2017
    #18
  4. DRPAS
    drpas Win User

    Windows 10/7 Dualboot doesnt boot / error

    I tried that and guess what, windows 7 doesnt start anymore. It Shows the same Error as Windows 10 did when I tried to Boot it after installing Windows 7 (something with a corrupted .exe). Im gonna stay With the virtualization because I think dual booting Just doesnt Work Out for me. Could Tell me the Command, to remove Windows 7 again?
     
    drpas, Aug 23, 2017
    #19
  5. LX07
    lx07 Win User
    msconfig

    Go to the boot tab and delete the entry.
     
    lx07, Apr 5, 2018
    #20
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Windows 10/7 Dualboot doesnt boot / error

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