Dual boot option disappeared after resetting one of the windows 11 installations


tskjaerpe

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7:25 PM
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OS
windows 11
I have a PC with a 500 GB SSD M2, with two partitions of 250 GB and one HD disk of 1,8 TB. I have installed windows 11 on both SSD partitions (dual boot), and use one for office work, and one mainly for Microsoft Flight Simulator (MFS).
MFS ran nicely for some months, but in the last few weeks, it refuses to start. Repeated attempts to update MFS only result in an error message saying "Something went wrong". Windows 11 is fully updated. I uninstalled MFS, but when I try to reinstall it, I get the same error message.
I then decided to make a complete reset of the corresponding Windows installation, leaving the other untouched. That seemed to work ok, but when I restart the PC the dual boot option is gone. My problem is: How do I get back the possibility to dual boot my system?
 

My Computer

System One

  • OS
    windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom made
    CPU
    Intel Core i7-8700K
    Motherboard
    AS Rock Z370M-ITX/ac
    Memory
    16 GB
    Graphics Card(s)
    NVIDIA GeForce GTX 980
    Sound Card
    Motherboard
    Monitor(s) Displays
    HP Z27 q
    Screen Resolution
    4K
    Hard Drives
    500 GB M2 WDC WDS512G1X0C. Two 250 GB partitions
    1,8 TB Hard Drive
    PSU
    750 Watts
    Case
    ITX Multicom
    Cooling
    ?
    Keyboard
    HP
    Mouse
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NavyLCDR

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Your other Windows partition should have a drive letter, let's say it is E:. In a command prompt with admin privileges the command would be:

bcdboot E:\Windows /d /addlast

Change the drive letter to whatever matches yours.
 

My Computers

System One System Two

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Homebuilt
    CPU
    AMD Ryzen 7 3800XT
    Motherboard
    ASUS ROG Crosshair VII Hero (WiFi)
    Memory
    32GB
    Graphics Card(s)
    EVGA GeForce GTX 1080 Ti
  • Operating System
    Windows 11 Education
    Computer type
    Laptop
    Manufacturer/Model
    Dell Inspiron 7773
    CPU
    Intel i7-8550U
    Memory
    32GB
    Graphics card(s)
    Nvidia Geforce MX150
    Sound Card
    Realtek
    Monitor(s) Displays
    17"
    Screen Resolution
    1920 x 1080
    Hard Drives
    Toshiba 512GB NVMe SSD
    SK Hynix 512GB SATA SSD
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tskjaerpe

Member
Thread Starter
Local time
7:25 PM
Posts
2
OS
windows 11
Thanks for responding. I tried your suggestion but mixed up the partitions, and was left without access to any of the Windows installations. Bummer. Luckily, I remembered that I had to enable PTT the first time I installed Windows 11. Checked BIOS, and secure boot was not enabled. I reenabled it, and suddenly I had dual boot back. Great relief.
 

My Computer

System One

  • OS
    windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom made
    CPU
    Intel Core i7-8700K
    Motherboard
    AS Rock Z370M-ITX/ac
    Memory
    16 GB
    Graphics Card(s)
    NVIDIA GeForce GTX 980
    Sound Card
    Motherboard
    Monitor(s) Displays
    HP Z27 q
    Screen Resolution
    4K
    Hard Drives
    500 GB M2 WDC WDS512G1X0C. Two 250 GB partitions
    1,8 TB Hard Drive
    PSU
    750 Watts
    Case
    ITX Multicom
    Cooling
    ?
    Keyboard
    HP
    Mouse
    Logitech m325
    Internet Speed
    200 Mbps
    Browser
    Microsoft Edge
    Antivirus
    Microsoft
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