User: Airioch

Regsnap will get your registry changes.

On: Good Freeware System Snapshot Tool For Windows?

Regsnap from LastBit Software will snapshot the entire registry and system file
lists (if you want it to) and save it out to a file. Once you make your changes
or installations you can snapshot it again and then directly compare the two files
and generate a difference file of all the changes to the system. It's a fairly
useful utility for capturing what installers/applications do to windows based
systems. Unfortunately it's not free.