Lost the NT Installation CD key

If you lose the CD jewel case for NT, you also lose the CD Key printed on it
unless you’ve written it down somewhere (OK – early senior moment, where did I
write that down?). 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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