Hi Samuel,
You can use the Scripting.FileSystemObject class to get a hard disk's serial number (check your MSDN documentation for a "SerialNumber" property to get the full info).
Another way to implement security for your applications could be to use the Windows' serial number.
HTH,
Solo se que nada se
Fausto J. Garcia Pino - MCSD.NET
.NET, Oracle, Tronador & Fondismo!