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.