Bootable ISO to remove Windows Server 2012 password?

You can try Hirens

 

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best way without any thirdparty apps is to boot from recovery media:

Code:

move C:\Windows\System32\sethc.exe to C:\Windows\System32\sethc.bak, 
copy C:\Windows\System32\cmd.exe C:\Windows\System32\sethc.exe

reboot and hit SHIFT Key 5 times at logon screen, an admin cmd will open, type

Code:

net user Administrator NewPass

logon with NewPass. CD to C:\Windows\System32\ in an admin console and
move sethc.bak to sethc.exe

done : )