Windows 10: Booting windows 10 after deleting grub.

Hi!


I am using windows 10 pro 64 bit . I have installed prime os in dual boot with windows 10.


I have only the windows 8.1 32 bit bootable media. because my usb capacity is only 3.72 GB


After deleting grub loader, can i fix the grub error by this windows 8.1 32 bit bootable media's command prompt?


please reply as soon as possible.


Thank you.

:)

 

Remove Grand Unified Boot Loader (GRUB) from Windows 10

I had that issue when Grub was deposited on my SSD when I had installed a Linux distro to a USB using Live Linux.

I followed the above and it didn't work, so despite installing windows again, the following below worked for me (Dell Inspiron 3148 notebook). Differences in latest version of Windows 10: CommandPrompt (Admin) is now PowerShell (Admin), and I found I had
to omit the /S when I removed the ubuntu boot directory, so I typed rmdir ubuntu It is copied and pasted from the Ask Ubuntu forum.

This answer is for those with UEFI who have deleted the Ubuntu partitions before removing grub

You will be doing this from Windows 10. No bootable media required.

Where bootrec /fixmbr, bootsect /nt60 and the Ubuntu live with the boot-repair suggestions have failed, this has worked for me:

(This answer borrowed verbatim from here)

• Run a cmd.exe process with administrator privileges
• Run diskpart
• Type: list disk then sel disk X where X is the drive your boot files reside on
• Type list vol to see all partitions (volumes) on the disk
• Select the EFI volume by typing: sel vol Y where Y is the SYSTEM volume (this is almost always the EFI partition)
• For convenience, assign a drive letter by typing: assign letter=Z: where Z is a free (unused) drive letter
• Type exit to leave disk part
• While still in the cmd prompt, type: Z: and hit enter, where Z was the drive letter you just created.
• Type dir to list directories on this mounted EFI partition
• If you are in the right place, you should see a directory called EFI
• Type cd EFI and then dir to list the child directories inside EFI
• Type rmdir /S ubuntu to delete the ubuntu boot directory

Assuming you only ever had two operating systems (Win 10 & Ubuntu) you should now be able to boot directly to Windows without hitting the black grub screen.

 

Deleting Grub GNU

I had installed Ubuntu as a dual boot option on my laptop. I have since deleted it but no matter what I have tried I can not get the grub loader off my computer. I have tried the following:

used disk manager to delete the Ubuntu partition

tried bootrec/fix mbr and fix boot

totally reset the PC deleting all files and reinstalling windows 10

Yet its still on my laptop. Windows loads fine but I would like still like the grub loader gone. I believe its in the EFI partition and am not sure if I delete the partition through "diskpart" if it will cause problems when booting the system and if I can
reinstall the EFI that's supposed to be there.

 

Dual boot not reaching windows, but grub detects it

After you move disks, partitions (eventually add/delete partitions) the principle for fixing boot is always:

1. Fix Windows boot
   
2. Fix GRUB boot
   

in that order.

Boot configuration should be such that Windows must be able to boot alone without the help of any other boot loader/manager!

What does Windows 10/8/7 use for booting with BIOS firmware (and MBR style disk):

1. MBR
   
2. PBR of active partition
   
3. bootmgr on active partition
   
4. BCD on active partition
   

in that order.

A Windows 10 installation/repair USB/DVD can be used to fix boot in this case.

See fix Windows 10/8/7 boot for help on repair steps.

For fixing GRUB you can use a Linux live CD/USB.

Be aware that after a Windows 10 version upgrade/update it possible that Windows will overwrite MBR (overwrite GRUB boot code in MBR)!

Suggestion - use Windows boot manager to dual-boot Windows and Linux.