WhatChanged

WhatChanged is a small system tool to verify any changes made to your registry in a matter of seconds.

To do this it uses two steps: the first creates an image of the current status of your system registry, and the second compares the new image to the old one. Of course, the first image must be taken right after installing the program.

WhatChanged is perfect for checking the Windows registry before and after installing a particular program. Just do the fist step before installing and that's it.