How to repair a win10 ssd install with no driver for usb repair ?

I have two Windows 10 installations on my PC. Primary and temp.
The primary installation cannot boot with error "The boot configuration data file is missing some required information ".

This happened aftter I wiped out another third disk which was the PC's original disk and apparently kept some boot info.

I have a USB boot disk but that does not see my Primary Windows 10 installation because the drive is running a 950 pro m.2 ssd which there is no drivers for when booted in the USB.

So there is no way that I know of, to use the USB and run a boot repair option on Primary installation.

The other Temp installation can boot into windows 10 and it does see my Primary installation's partition ... but how do I repair Primary while booted in Temp ?

It is a UEFI pc.

From an elevated ("run as administrator") command prompt type:

bcdboot D:\Windows

The drive letter in red will be the drive letter to your primary Windows 10 assigned by the temp Windows 10.

Then run msconfig, select the boot tab, and adjust the time delay to make your selection and the Windows 10 that you want as default.

You can also install and run EasyBCD to edit your boot menu to change the names of the Windows entries on the boot menu to whatever you want.

NavyLCDR said:

From an elevated ("run as administrator") command prompt type:

bcdboot D:\Windows

The drive letter in red will be the drive letter to your primary Windows 10 assigned by the temp Windows 10.

Then run msconfig, select the boot tab, and adjust the time delay to make your selection and the Windows 10 that you want as default.

You can also install and run EasyBCD to edit your boot menu to change the names of the Windows entries on the boot menu to whatever you want.

Hi, thanks for helping,

The command bcdboot D:\Windows succeeds but the SSD still cannot boot with the same error see screenshot http://oi67.tinypic.com/16ia5js.jpg

It is a GPT partition and UEFI bios...

When booting my secondary temp installation I can press Esc and then choose my Primary installation from the boot menu, this will boot my Primary. But it can't boot automatically .. yet.

What is the partition layout on all the drives?
Disk Management - How to Post a Screenshot of - Windows 10 Forums

Here are my disks :




The C: drive wasn't booting on its own even after I tried bcdboot c:\windows

Instead I had to do bcdboot c:\windows /s m: /f All

where m drive was assigned to the 260 MB EFI partition.

In other words the UEFI setup was expecting the boot manager to go to the EFI partition and will not accept it being in C: drive...

Maybe the EFI standard requires this, in disks where there is a dedicated EFI partition? Possibly,

Thanks for helping guys, all done now.