Registry Changes

I need to be able to monitor changes in the registry... Either by by comparing 2 snapshots or real-time. Creating and comparing 2 registry snapshots might take a while.....? If so, real-time would be better but I am not sure how to go about that at all. Can someone provide some ideas or something for this?

This could be a start:
http://www.sysinternals.com/Utilities/Regmon.html
under How Regmon works.

I use a lot of system internals products at work they all work very well

i also try regmon