How can I tell when Windows NT was installed?

A. Windows NT stores its install time in the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\InstallDate in seconds from January 1, 1970. I've written a utility you can use that will display this and other information (in converted form). You can download the utility from http://www.savilltech.com/download/wininfo.zip.

WinInfo

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