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Go to the Nirsoft website Force mentioned above. They have a utility called USB Deview. Works great - we have used it for years. We have a script running that calls the utility every time a machine logs in and puts a copy of the log in a folder on a file server where we can review them. If you have a domain you can also use Group Policies to disable users adding USB devices to their machines. Only so much you can do though; people still have DVDs, the Internet, access to networks, etc,