diskpart - How to create windows 8 boot partition on drive that never had one?

So 3 months ago I built a PC, but had the opportunity to borrow an SSD from my place of employment. I originally installed windows 7 trial mode on that SSD, and then after a few weeks upgraded to windows 8, but installed it on a second hard drive. I then wiped the SSD (at least I thought i did the whole drive), and used it as a data drive in windows 8.

Today I took the SSD out of my system to take back to work, and immediately formatted the whole thing to put ubuntu server on it for work. Now I'm back home and the windows 8 drive can't boot anymore. Apparently when windows 8 was installed, it just replaced windows 7's boot loader with its own, but on the ssd.

So For the past 2.5 months I've been booting to the ssd, which has then been forwarding to the hard drive's OS sector. Now that the SSD is gone (and completely wiped), the chain is broken and I don't have a boot sector. How do I create one without re-installing windows entirely?

I have a windows 8 installation USB key that I can get into recovery mode with. Here's some stuff from diskpart that i've transposed from photos:

DISKPART> LIST VOL

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info

  ----------  ---  -----------  -----  ----------  -------  ---------  --------
  Volume 0                      NTFS   Partition    465 GB  Healthy
  Volume 1     C   ESD-USB      FAT32  Removable     14 GB  Healthy

DISKPART> LIST DISK

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
* Disk 0    Online          465 GB      0 B        *
  Disk 1    Online           14 GB      0 B


DISKPART> LIST PARTITION

  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
* Partition 1    Reserved           128 MB  1024 KB
  Partition 2    Primary            465 GB   128 MB

DISKPART> ACTIVE


The selected disk is not a fixed MBR disk.
The ACTIVE command can only be used on fixed MBR disks.

It looks like there's space for a boot sector there, but I can't assign that reserved partition a drive letter, which is as far as I could get with https://superuser.com/a/504360

I can't set that partition as active either, cus the drive table isn't mbt.

Thanks.