useful when u need something unique from the PC and easy to get HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion installdate value InstallDate REG_DWORD Time (in seconds) since 12:00 A.M, January 1, 1970 here's a VBS script which displays the info: Dim WshShell, TimeStampSet WshShell = WScript.CreateObject("WScript.Shell")TimeStamp = WshShell.RegRead(_"HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\installdate")WScript.Echo "Install date :" & _DateAdd("s", TimeStamp, DateSerial(1970, 1, 1))