1. Using WinXP Installer CD, Boot from CD and select the first repair option (R) which will take you to the Recovery Console. Now copy the missing/corrupt file from the CD to your hard disk by typing ‘copy D:\i386\ntoskrnl.exe C:\Windows\system32\ntoskrnl.exe’ (remove the quotes) and press Enter. 2. If you can only find ntoskrnl.ex_ on the CD then the file needs to be expanded by typing ‘expand D:\i386\ntoskrnl.ex_ C:\Windows\system32\ntoskrnl.exe’ (quotes not included) and press Enter. If 1 and 2 above do not work, rename the file by typing ‘ren C:\Windows\system32\ntoskrnl.exe C:\Windows\system32\ntoskrnl.old’ (remove quotes) and press Enter. Then try again. 3. If it’s still not working, type chkdsk /r (note the space) and press Enter.