You Receive The Error Missing or corrupt ntoskrnl.exe file On Boot

1.     Insert the Microsoft Windows XP CD. Note: If you have a recovery CD or a restore CD and not a Microsoft Windows XP CD it is likely the below steps will not resolve your issue.

2.     Reboot the computer, as the computer is starting you should see a message to press any key to boot from the CD. When you see this message press any key.

3.     In the Microsoft Windows XP setup menu press the R key to enter the recovery console.

4.     Select the operating system you wish to fix, and then enter the administrator password.

5.     Type expand d:\i386\ntoskrnl.ex_ c:\windows\system32

6.     You will then be prompted if you wish to overwrite the file type Y and press enter to overwrite the file.

7.     Type exit to reboot the computer.