“Missing or corrupt Ntfs.sys” error message when you restart Windows XP after you convert your hard disk to the NTFS file system

This problem may occur if the Ntfs.sys file is missing or becomes corrupted when you convert your hard disk to NTFS.

convert drive: /fs:ntfs

1. To resolve this problem, replace the missing or corrupted Ntfs.sys file:
   Use the Windows XP startup disks or the Windows XP CD to restart  your computer.
2. When the “Welcome to Setup” screen appears, press R to select the To repair a Windows XP installation using Recovery Console, press R option.
3. Type the number of the Windows installation that you want to access from the Recovery Console, and then press ENTER.
4. Type the administrator password when you are prompted, and then press ENTER. If no administrator password exists, just press ENTER.
5. At the command prompt, type the following commands (press ENTER after each command):
   cd \windows\system32\drivers
   ren ntfs.sys ntfs.old
   Note This step renames the corrupted Ntfs.sys file to Ntfs.old. If the Ntfs.sys file is not found, the file is missing.
6. At the command prompt, type the following command, and then press ENTER:
   copy cd:\i386\ntfs.sys drive:\windows\system32\drivers
   Where cd is the drive letter for the CD-ROM drive that contains the Windows XP CD, and drive is the drive where you installed Windows XP.
7. Remove the Windows XP CD from your CD-ROM drive, type quit at a command prompt, and then press ENTER to quit the Recovery Console.
8. Restart the computer.