RegistryChangesView is a new tool for Windows that allows you to take a snapshot of Windows Registry and later compare it with another Registry snapshots, with the current Registry or with Registry files stored in a shadow copy created by Windows. When comparing 2 Registry snapshots, you can see the exact changes made in the Registry between the 2 snapshots, and optionally export the Registry changes into a standard .reg file of RegEdit.
You can download RegistryChangesView from this Web page.