Microsoft KB Archive/100315

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Knowledge Base

Steps performed by the Emergency Repair Disk

Article ID: 100315

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.1
  • Microsoft Windows NT Workstation 3.5
  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 3.5
  • Microsoft Windows NT Server 3.51
  • Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q100315


The following steps are performed by the Emergency Repair Disk:

  1. Runs CHKDSK on the partition containing Windows NT system files. On Intel x86 machines, also runs CHKDSK on the system partition (this is optional and must be enabled manually).
  2. Verifies that each file in the installation is good, through a checksum algorithm. If files are missing or corrupt they are restored from the installation disks.
  3. Replaces the default system and security (SAM) Registry hives, subject to user confirmation.
  4. Reinstalls Boot Loader (that is, the boot sector, BOOT.INI, NTLDR, etc.)

Note: The Emergency Repair disk is machine specific, and should only be used on a system on which it was created.

Additional query words: tshoot repair

Keywords: kbinfo KB100315