Win 10 crashed and stopped booting from Dual boot.

So,

1. Download the Kyhi's Modified Recovery Media & Prepare the Pen drive UEFI Boot Media with Rufus

2. Detach all the other disks except Disk 1 ( Windows 10 ).

3. Boot into the Recovery Media ( Small OS ) as in point 1.

4. NEED TO BE VERY CAREFUL FROM HERE! I HAVE SEEN GOOD PEOPLE LOSING IMPORTANT PARTITIONS. PROCEED ONLY IF YOU ARE SURE. CHECK FOR ANY ERRORS WHEREVER, NOTE DOWN, STOP THERE & REPORT

( i ) From that boot media > launch DiskGenius > move / resize H: partition from left side to make 260 MB Unallocated space to the left of it. ( May Be That The Partition Letter For Windows 10 H: Partition, Differs From This Boot Media. Be Careful! )

( ii ) Then Right click on the unallocated space we have made just now & Choose To Make EFI Partition from the context menu on it.

( iii ) Once its done. Make sure that the EFI Partition is assigned the letter S:. If not do it yourself.

( iv ) When all applied & done, close the DiskGenius.

( v ) Again launch DiskGenius. Make Sure & Note down the letter S: is assigned to EFI Partition & What is the letter assigned to Windows 10 partition. Then close the DiskGenius.

( vi ) launch Command Prompt & Let us double check the partition letters. Enter after every command.

Diskpart

List Disk

( Only Two Are There : Windows 10 & Pen drive )

Select Disk 0

( Change 0 to whatever no. is shown as per the List Disk command for the Windows 10 Disk )

List Partition

( Note down the letter of EFI partition as S: & Windows 10 Partition's letter )

EXIT

( vii ) Run the below command while changing the letter c: with that of Windows 10 partition's letter.

bcdboot C:\Windows /s S: /f UEFI

Exit.

5. Shut Down From The Recovery Media. Take Out The Pen Drive. Only Windows 10 Disk Is Connected Now! Try To Boot Into It.

Thanks. ...

NavyLCDR said:

Open a command prompt with admin privileges in Windows 7 and run:

Code:

bcdboot H:\Windows /d /addlast

Assuming your Windows 10 is still H: drive.
If that succeeds, reboot the computer.
What happens when you select Windows 10 from the dual boot menu?

Great Stuff Sir!

Just a remark : It will not make the Windows 10 drive bootable independently of the Windows 7 drive. Will it ?

Thanks. ...

NavyLCDR said:

No, that particular command won't. But if the second Windows 10 drive has a system or active partition on it, then you give the system or active partition a drive letter. Let's say you give it X:. While you are booted into the Windows on the drive you want to make bootable the command would be either:

Code:

bcdboot C:\Windows /s X: /f UEFI

or

bcdboot C:\Windows /s X: /f BIOS

Pick the method of booting after /f, UEFI or legacy BIOS. You can also put ALL after /f and it will write boot files that will boot in both modes.

Great Stuff

Thanks. ...

So,

1. Keep Windows 10 disk connected & all the other disks disconnected.

2. Insert pen drive & Boot into the Recovery media we prepared.

3. Launch Command Prompt & run the below command :

chkdsk /r H:

'H:' represents the drive letter for Windows 10 partition from the Recovery media.

It can take a long time. Let it complete. Let me know if it reports any problems & repair.

4. From the Recovery media boot itself, Launch the Macrium Reflect program & choose to Fix Boot Errors

When completed, shut down, take out the pen drive & try to boot into Windows 10.

Let me know.

Thanks. ...

ShaneSaunders said:

I can't complete the process with Macrium Reflect

Where you got stuck exactly ? How far you made ?