You would boot from the "Windows Installation Media"
Then when asked where to install (HDD Partition Screen)
Delete EVERY partition
and point to the unallocated disk space
Windows will create it's own partitions....
use diskpart to assign the drive letter R
open file explorer and post a screen shot of the files and folders on R
You can now browse thru R and find Install.wim or Install.swm(s) - those are your Factory recovery Images..
there are two different settings..
One is for Recovery Tools (WinRE.wim)
One for the Factory Image
You would boot into WinRE to Restore the Factory Image...
Not sure what you mean "it just boots into ISO recovery"
we need to find the image and partition - Note the Drive letter Assignment will be temporary..
right click start flag > command prompt(admin)
type> select disk 0
type> list volume
type> list partition
(post a pic of cmd window)
You will see a lot of volumes without...
needless to say your post is all over the place... with that said what are you trying to do ??
remove a custom recovery image - from command prompt(admin) type
if image is registered then type
if the PC did not come with windows 8/8.1 Pre-installed
then you will need to use a Valid Activation Key....
If the PC came with windows 8/8.1 then no key is needed as the key will be embedded into the BIOS
Windows 8 & 8.1 had the product key embedded into the bios...
What edition of windows 8.1 are you trying to install ??
There is a Home Edition and a Pro Edition - be sure the OS Edition matches the embedded key
we do not do any password hacking here..
But you can access the OS and maybe reset the password by using a Rescue Disk
Windows 10 Recovery Tools - Bootable Rescue Disk Solved - Windows 10 Forums
or maybe you prefer to create your own Rescue Media
Win10XPE - Build Your Own Rescue Media - Windows...
You can expand the partition to the left (or Right) to use available unallocated free space without issue...
If you where to move the partition to the left or right of another partition then you would have an issue