Wiping System to Re-install Win 7 - now "missing operating system"

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  1. Posts : 20,583
    Win-7-Pro64bit 7-H-Prem-64bit
       #11

    Hi,
    Well to be safe I would also get another drive and leave that one alone
    You can try to reset your bios to default if you haven't already possibly the F5 key ?

    Pretty weird I would also try power drain
    Remove the battery and hold down the power button for 1 minute
    Reinsert the battery and use the F8 key should work to change the boot device without going into the bios as said.
      My Computer


  2. Posts : 6,330
    Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
       #12

    It could be a bad media DVD disc.
    Try the disc on another PC and see if it can boot.

    Work through this tutorial by gregrocker:
    Troubleshooting Windows 7 Failure to Boot
      My Computer


  3. Posts : 216
    Windows 7
       #13

    Sasha100 said:
    1) the laptop is turned on and the message is my my screen: "missing operating system".
    2) I put in the 'Boot Disk' or the 'Win 7 Disk' into the DVD/CD slot.
    3) I turn off my computer.
    4) I turn on my computer and when the Dell logo appears I tap F12 to get the 'Boot Menu'.
    Stop right there. If you already changed the boot order to cd/dvd first then it should boot
    with your W7 installation disk in. Seems you may be interfering with boot order and it goes back
    to try and boot hard drive with no OS on it. Maybe?
      My Computer


  4. Posts : 25,847
    Windows 10 Pro. 64/ version 1709 Windows 7 Pro/64
       #14

    I'm inclined to believe that what ever disc is being used is not bootable.
      My Computer


  5. Posts : 2
    Windows 11 (x64)
       #15

    You must have deleted the "System Reserved" partition, which contains BOOTMGR, the file that tells the computer what operating systems there are and where they are located.

    Be a bit more careful next time.

    P.S. If you are on the windows installer already, then you can safely delete the system reserved partition, but don't do it if you're not already on the windows installer.
      My Computer


  6. Posts : 341
    Windows 7 Home Premium 64-bits
       #16

    I see you also have a desktop. Put the Windows 7 DVD into the desktop's DVD drive and see if you can boot using it. If it boots using the desktop but not the laptop then either you are not doing something right or there is something wrong with the laptop's DVD drive.
      My Computers


 
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