Repair Dual Boot Windows 7 and 10 after Reinstall Windows 7

[deny_kp]

So, i used to have dual boot windows 7 and windows 10. Overall everything works fine..
Then i come in a condition where need to reinstall windows 7.
After reinstall windows 7, my windows 10 is missing from the boot menu...
Then i try to startup repair using windows 10 installer, but the repair can't find the windows 10 installation.
Can I do something to repair the dual boot without reinstall the windows 10 too...

 

[SouthQuay95]

1. Press Windows key + X

2. Click Command Prompt (Admin)

3. At the command prompt, enter the following command:

bcdedit /set {bootmgr} displaybootmenu yes

4. Hit Enter on your keyboard

5. Type: Exit

6. Restart and you should be offered a boot menu to choose which version of Windows you want to boot into.


If that doesn't work,


Press Windows key

Type: view advanced system settings

Hit Enter

Under Startup and Recovery, click Settings

Click in the Default operating system list box

Select the other operating system

Click OK

Click OK again

You should be able to select the other operating system when you start the computer.

 

[deny_kp]

I've try your step before, it only show the boot menu, but still my windows 10 is not on the list...
btw i've solve it by this command that i found in here:
http://www.tomshardware.com/forum/id-2745734/selection-boot-menu-dual-booting-windows-fix.html

bcdboot F:\Windows

(where F: is the partition where my windows 10 installed)

btw thanks for your help...

 

[MackieH]

If that doesn't work,


Press Windows key

Type: view advanced system settings

Hit Enter

Under Startup and Recovery, click Settings

Click in the Default operating system list box

Select the other operating system

Click OK

Click OK again

You should be able to select the other operating system when you start the computer.
[/QUOTE]


Thanks man!
This last part of your post solved my problem too!
Many thanks!