http://www.annoyances.org/exec/show/registry

There is much good general information here that every user can understand and put to use. As an example when you download ZAP and save the file in case of a problem, then install it, this article will show you how to back up a portion of the registry for later use. In this way maybe by saving ZAP parts of the registry you could help restore your system in event of a problem. Just a thought .