Windows 10 bootloader not working

Question

I recently uninstalled ubuntu from my dual boot system and since then whenever I start my system

System BootOrder not found. Initializing defaults.
Reset System

appears. Can anyone help? This keep repeating every 3-4 seconds. I can access boot menu and then windows 10 starts but why I can't simply go to windows 10?

What is the computer? Please add photos of your BIOS and especially of boot order and Security settings. — harrymc, Feb 28 '19 at 17:27
What do you mean by computer? It's HP 15r-014tx i5 laptop. boot order is showing nothing but OS boot manager and efi. and what I did not understand what do you mean by security settings — rs4, Feb 28 '19 at 17:29
Can you get into the BIOS? Most often this is done by pressing F2 during the boot. While in the BIOS, you will find somewhere the boot order, and you might have a section named something like Security, depending on the BIOS version. — harrymc, Feb 28 '19 at 20:16
Check this [question](https://askubuntu.com/questions/1042747/system-bootorder-not-found). — GChuf, Jul 06 '20 at 11:07
Boot to WinPE/WinRE and do the following: **If UEFI:** this likely occurred from Ubuntu modifying or removing the EFI partition. To recreate, see Steps 3 and 5 at the end of [this](https://superuser.com/a/1581804/529800) answer; **If BIOS:** `BootRec /FixMBR && BootRec /FixBoot && BootRec /RebuildBCD` — JW0914, Jan 24 '22 at 12:58

score 0 · Answer 1 · answered Feb 28 '19 at 17:48

0

When you delete or otherwise uninstall Ubuntu from a Windows 10 system the Grub bootloader remains. You need to get rid of it by using a repair disk to get to the command prompt, and type

bootrec.exe /fixmbr

Restart and you should be good. A detailed write up with pics can be found at Uninstall Linux dual-boot

answered Feb 28 '19 at 17:48

RWW

152
6

Your solution did not work. – rs4 Mar 01 '19 at 17:58
When you say it didn't work, did you still get an "operation completed successfully" message in the cmd prompt, but it still failed to boot afterwards? – RWW Mar 01 '19 at 21:19
yes, that's what i meant – rs4 Mar 02 '19 at 12:49
This answer is missing the two additional `BootRec` commands required. – JW0914 Jan 24 '22 at 13:58

score 0 · Answer 2 · answered Jan 24 '22 at 13:52

This likely occurred due to modifying/removing the boot partition during the removal of Ubuntu:

Boot to WinPE/WinRE
^{(Windows install USB: once GUI loads, Shift+F10 to access terminal)}

Select the OS drive: ^(DiskPart)

DiskPart

  Lis Dis
  Sel Dis #

Create boot partition: (if boot partition exists, go to Step 3, else create it)
BIOS:

::# List partitions and select the OS partition:
    Lis Vol
    Sel Vol #

::# Partition should be 100MB formwatted:
    Shrink desired=130 minimum=130

Cre Par Pri Size=128
Format Quick Fs=NTFS Label=Boot
Active

UEFI:

::# List partitions and select the OS partition:
    Lis Vol
    Sel Vol #

::# Formatted size: EFI: 260MB | MSR: 128MB
    Shrink desired=400 minimum=400

Cre Par EFI Size=100
Format Quick Fs=FAT32 Label=EFI
Assign Letter=Y
Cre Par Msr Size=16

Resolve any boot issues:
BIOS:

BootRec /FixMBR && BootRec /FixBoot && BootRec /RebuildBCD

UEFI:

::# With existing bootable EFI partition:
    BootRec /FixMBR && BootRec /RebuildBCD


::# Without existing bootable EFI partition:
    ::# Create EFI directories and enter:
        MkDir "Y:\EFI\Microsoft\Boot"
        Cd /d "Y:\EFI\Microsoft\Boot"

    ::# Create EFI boot structure:
        BootRec /Fixboot

        ::# If Access Denied error occurs (C: is OS partition):
            BcdBoot C:\Windows /s C: /f UEFI

    ::# Resolve any other boot issues:
        BootRec /FixMBR && BootRec /RebuildBCD

Remove EFI mountpoint (if applicable) → Reboot: wpeutil reboot
```
DiskPart

  Sel Vol Y
  Remove
  Exit
```

Windows 10 bootloader not working

2 Answers2