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I had dual booted Ubuntu alongside Windows 10. I then deleted the Ubuntu partition using the Windows disk management system. But GRUB hasn't been deleted and it shows the dialogue below every time I start my PC.

Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists possible device or file completions.
grub>

grub dialog

BeastOfCaerbannog
  • 14,585
Sarker Md. Sadman
  • 1

1 Answers1

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To restore the default Windows 10 bootloader, do this:

  1. Log into Win 10
  2. Open "Command Prompt" as Administrator
  3. Type bootsect /nt60 <drive name>: /mbr

Note that <drive name> is the drive letter where the Master Boot Record (MBR) will be updated. For example to update the master boot record on C:, this is the command:

bootsect /nt60 c: /mbr

For more information about bootsect command, Microsoft has you covered