NTOSKRNL Missing or Corrupt

If you get an error that NTOSKRNL not found:

Insert and boot from your WindowsXP CD.

At the first R=Repair option, press the R key

Press the number that corresponds to the correct location for the installation of Windows you want to repair.Typically this will be #1

Change to the drive that has the CD ROM.

CD i386
expand ntkrnlmp.ex_ C:\Windows\System32\ntoskrnl.exe

If WindowsXP is installed in a different location, just make the necessary change to C:\Windows

Take out the CD ROM and type exit