Create boot partition

[Docfxit]

I'm having a hard time creating a System (Boot) partition.
These are the partitions I'm working with:

DISKPART> list volume

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
  Volume 0     G   ESD-ISO      UDF    CD-ROM      4562 MB  Healthy
  Volume 1     C   SYSTEM       FAT32  Partition    500 MB  Healthy
  Volume 2     E   VBox Win10   NTFS   Partition     45 GB  Healthy
  Volume 3     F                NTFS   Partition    550 MB  Healthy    Hidden
  Volume 4     D   GARY'SWIN10  NTFS   Removable     28 GB  Healthy

I did change the partition letters to:
Volume 1 H:
Volume 2 C:
I don't know why but they changed back.
This is where I currently am:

Windows Boot Manager
--------------------
identifier              {bootmgr}
device                  partition=H:
path                    \bootmgr
description             Windows Boot Manager
inherit                 {globalsettings}
default                 {default}
resumeobject            {72d3c836-cda6-11ed-b638-08002770a80a}
displayorder            {default}
                        {72d3c836-cda6-11ed-b638-08002770a80a}
timeout                 5

Windows Boot Loader
-------------------
identifier              {default}
device                  partition=H:
path                    \Windows\system32\winload.exe
description             Windows 10
locale                  en-US
inherit                 {bootloadersettings}
bootdebug               No
osdevice                partition=H:
systemroot              \Windows
nx                      OptIn

Windows Boot Loader
-------------------
identifier              {72d3c836-cda6-11ed-b638-08002770a80a}
device                  partition=C:
path                    \NST\ntldr
description             Windows XP
locale                  en-US
osdevice                partition=C:
systemroot              \Windows
detecthal               Yes

I don't have Windows XP. I don't know how to remove it.
I have tried booting to a Windows 10 .ISO and running Startup Repair.
It doesn't boot.

I have run:
md C:\boot
copied wgl4_boot.ttf To C:\boot
md C:\boot\en-us
copied bootmgr.exe.mui To C:\boot\en-us
c:
CD\
BOOTREC /fixmbr Successful
BOOTREC /fixboot Access Denined
bcdboot E:\windows /l en-us failed
BOOTREC /fixboot Access Denined

I can't get past this.