Lost the NT Installation CD key

by Wayne Maples [Published on 20 April 2004 / Last Updated on 20 April 2004]

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 NT\CurrentVersion\ProductId.
  • 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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