Hard Drive Intergrety Status

[Nicolas Kramer <nicolaskf () gmail com>]

Can anyone help me with an aplication or method that can succeed in
the following task.

Check about 60 computers on LAN and all same workgroup the local C:
harddisk for changes. And if any changes found (as minimal as
possible, like new folder or new suspisious files or something) be
reported to the server.

All the local hdd are almost exactly the same if not exactly the same.
Server is running win2003 and the clients are all WinNT

Any idea how i can accomplish this task? (mayb like a MD5 sum or
somthing in that way(though md5 is for files) or an integrety checker,
i heard about it but have no knowledge about it, and google isnt
helping me out atm)

Thank you very much.
Nico

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Nico