NTFS.sys corrupted

I am using Windows 2000 Pro and I am not able to boot to windows due to NTFS.sys file corrupt. I tried to boot using boot disk or CD setup yet I get the same failure. Even in the safe mode I could not get into command prompt. I do not want to format the drive , because I do not want to use the programs and data on the hard disk.

I even attached another clean hard disk with Win 2k Pro and made it as Master, yet I get the same error message.

Any suggestion?