Start the computer by using Windows 2000 Server computer CD-ROM and choose tools to repair the installation. Select recovery console and copy the NTLDR file on the CD-ROM to the root of the system vol
Start the computer by using Windows 2000 bootable floppy disk. Run the file signature verification utility
Start the computer by using the Windows 2000 bootable floppy disk. From a command prompt run the sfc/scanboot command
Start the computer by using the Windows 2000 server CD- ROM, choose to reinstall. When the installation is complete copy the NTLDR to the root of the boot volume