Ntoskrnl.exe corrupt Permanent Solution

ntoskrnl.exe (and ntkrnlpa.exe on systems with Physical Address Extension support) is the kernel image for the family of Microsoft Windows NT operating systems. It provides the kernel and executive layers of the Windows NT kernel space, and is responsible for various system services such as hardware virtualization, process and memory management, etc., thus making it a fundamental part of the system. It contains the cache manager, the executive, the kernel, the security reference monitor, the memory manager, and the scheduler, among other things.

Remedy

Boot to the installation CD.
When offered the choice to Install, Repair, or Quit, select repair.
When prompted select the installation you want to repair (usually "1" ).
When prompted enter the administrator password (if any).
The screen will show:

C:\Windows

Find the drive letter of your CD by typing:

cd D:\

If that finds the CD, it will show

D:\

on the screen.

Then type

copy ntoskrnl.exe C:\WINDOWS\SYSTEM32

and press the enter key.

The next line should show it was successfully copied.

Power-off.
Power-on.
The computer should now POST and boot into xp64.