Windows 10: Win 10 keeps losing dual boot info Solved

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  1. Posts : 102
    Vista, Win 7, Win 8.1, Win 10 TP
       26 Apr 2015 #1

    Win 10 keeps losing dual boot info


    Hi there. I had been dual-booting between win 7 and win 10. That part was working fine, but I was unhappy wth my win 10 installation. So I erased the partition and reinstalled it. First sign of trouble: It didn't detect my win 7 installation. But it was there (I already got files from it). I installed EasyBCD, added the entry for win 7, saved the set up, then wrote the MBR with the new entry. Went to MSConfig to doublecheck. Both entries were there.
    I restarted, and it booted straight into Win 10. EasyBCD no longer had the win 7 entry. Neither did MSConfig. Went through the whole process again. Same problem at restart. And it wasn't fastboot, I could see the BIOS entry, etc.
    What went wrong? Thanks in advance for your help.
    P.S. By Windows 10 I mean Build 10049.
      My ComputerSystem Spec


  2. Posts : 4,533
    Win 10 Pro x64
       27 Apr 2015 #2

    When you wiped out Win 10, did you check if Win 7 boots up? You have to make sure that the host OS is booting up as normal before installing the second OS.
      My ComputerSystem Spec


  3. Posts : 102
    Vista, Win 7, Win 8.1, Win 10 TP
    Thread Starter
       27 Apr 2015 #3

    Thanks, badrobot. No, I did not make sure. After doing stuff like that many times with no problem, I never thought of it.
      My ComputerSystem Spec


  4. Posts : 8,898
    Windows 10 Professional
       27 Apr 2015 #4

    gallicbear said: View Post
    Hi there. I had been dual-booting between win 7 and win 10. That part was working fine, but I was unhappy wth my win 10 installation. So I erased the partition and reinstalled it. First sign of trouble: It didn't detect my win 7 installation. But it was there (I already got files from it). I installed EasyBCD, added the entry for win 7, saved the set up, then wrote the MBR with the new entry. Went to MSConfig to doublecheck. Both entries were there.
    I restarted, and it booted straight into Win 10. EasyBCD no longer had the win 7 entry. Neither did MSConfig. Went through the whole process again. Same problem at restart. And it wasn't fastboot, I could see the BIOS entry, etc.
    What went wrong? Thanks in advance for your help.
    P.S. By Windows 10 I mean Build 10049.
    It's probably still there, press and hold Shift while clicking Restart to see if you get 'Chose another operating system' option.

    Click image for larger version. 

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      My ComputersSystem Spec


  5. Posts : 4,533
    Win 10 Pro x64
       27 Apr 2015 #5

    gallicbear said: View Post
    Thanks, badrobot. No, I did not make sure. After doing stuff like that many times with no problem, I never thought of it.

    Win 10 always sets itself as a default but you can always change it in msconfig. The problem is if 7 has boot problem before installing 10, you will not get dual boot options and will go straight to 10.
      My ComputerSystem Spec

  6.    27 Apr 2015 #6

    Have you tried to repair windows7 with Startup repair by booting from 7 install media. You must have deleted your active partition when you installed 10.
    http://www.sevenforums.com/tutorials...air.html?ltr=S
      My ComputerSystem Spec


  7. Posts : 102
    Vista, Win 7, Win 8.1, Win 10 TP
    Thread Starter
       27 Apr 2015 #7

    Thanks, Edwin. Holding Shift with Restart got me into Startup Repair. But no, it didn't give me the option of Windows 7.

    Thanks, Charlie, for the tip of repairing Windows 7. I will try that today and post back.
      My ComputerSystem Spec

  8.    27 Apr 2015 #8

    Code:
    bcdboot C:\Windows
    Type that in an elevated command prompt and it should take care of your boot files. Do the same with your drive letter for the other installation.
      My ComputerSystem Spec


  9. Posts : 102
    Vista, Win 7, Win 8.1, Win 10 TP
    Thread Starter
       27 Apr 2015 #9

    Thanks, cyberrufus. Didn't need that.
    I did what Charlie suggested, and repaired the win 7 installation. Everything is ok now.

    Thank you all guys, for your tips.
      My ComputerSystem Spec

  10.    29 Apr 2015 #10

    You can also use: Download EasyBCD - MajorGeeks to resolve boot issues and boot order.
      My ComputersSystem Spec


 
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