Recover Lost CD Key

If you lose the CD case for the NT install, you also lose the CD Key unless
you’ve written it down somewhere. This is a problem when you need to reinstall.

  • The CD Key is digits 6 through 15 of HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
  • Using Windows NT Diagnostics, the CD Key is digits 6 through 15 on the
    fourth line of information on the Version tab.
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