Can't Boot into Windows 10, Grub Rescue and Bootrec /FixMBR doesn't work

So the title pretty much says it all...

I have a computer with 2 drives, a 256GB SSD and a 512GB HDD. I have my Windows 10 installation on the SSD and I partitioned the HDD to serve as my Ubuntu installation (I gave ubuntu like 80GB of space)

I wanted to remove it.

So I installed a recovery disk on a USB drive.

Deleted my ubuntu partition and extended the HDD volume.

Booted into the USB and started up command prompt.

Ran Bootrec /FixMBR (or bootrec.exe /fixmbr)

Rebooted and I get a Grub Rescue prompt.

I searched around the internet and found that apparently I should also run bootrec /fixboot... but anytime I try to do that, it gives me access denied.

I also followed this guide

but I can't find an EFI folder in my C: drive (the one with my Windows OS on it)

What am I doing wrong? I've been at this for an 2 hours now and I don't understand how to fix this. I can't even just restore the windows OS or restore from a restore point because they give me errors like no windows installation found.

Btw this installation of windows 10 is one that I upgraded from Windows 8 so I have a Windows.old folder in my C: drive... not sure if that affects anything?

1 Answer

So if anyone finds this... I figured it out... After trying several utilities and several options

booting from a windows recovery disk or windows install disk and launching command prompt, I ran bootsect /nt60 <drive name>: /mbr and it fixed it!!